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Vulnerability from cleanstart
Published
2026-05-18 14:00
Modified
2026-05-02 05:43
Summary
Security fixes for CVE-2025-15558, CVE-2026-1229, CVE-2026-25934, CVE-2026-27896, CVE-2026-33252, CVE-2026-33762, CVE-2026-34165, CVE-2026-34742, ghsa-37cx-329c-33x3, ghsa-89xv-2j6f-qhc8, ghsa-f6x5-jh6r-wrfv, ghsa-gm2x-2g9h-ccm8, ghsa-j5w8-q4qc-rx2x, ghsa-jhf3-xxhw-2wpp, ghsa-p436-gjf2-799p, ghsa-q382-vc8q-7jhj, ghsa-q9hv-hpm4-hj6x, ghsa-wvj2-96wp-fq3f, ghsa-xw59-hvm2-8pj6 applied in versions: 0.9.7-r1, 0.9.8-r0
Details
Multiple security vulnerabilities affect the gptscript package. These issues are resolved in later releases. See references for individual vulnerability details.
References
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"details": "Multiple security vulnerabilities affect the gptscript package. These issues are resolved in later releases. See references for individual vulnerability details.",
"id": "CLEANSTART-2026-LO26058",
"modified": "2026-05-02T05:43:12Z",
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"url": "https://osv.dev/vulnerability/CVE-2026-1229"
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"url": "https://osv.dev/vulnerability/CVE-2026-25934"
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"url": "https://osv.dev/vulnerability/CVE-2026-33762"
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"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-34165"
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{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-34742"
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{
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"url": "https://osv.dev/vulnerability/ghsa-37cx-329c-33x3"
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{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-89xv-2j6f-qhc8"
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"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-f6x5-jh6r-wrfv"
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{
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{
"type": "WEB",
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"type": "WEB",
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{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-p436-gjf2-799p"
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{
"type": "WEB",
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"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-q9hv-hpm4-hj6x"
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{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-wvj2-96wp-fq3f"
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"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-xw59-hvm2-8pj6"
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{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-15558"
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{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27896"
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{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33252"
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{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33762"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34165"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34742"
}
],
"related": [],
"schema_version": "1.7.3",
"summary": "Security fixes for CVE-2025-15558, CVE-2026-1229, CVE-2026-25934, CVE-2026-27896, CVE-2026-33252, CVE-2026-33762, CVE-2026-34165, CVE-2026-34742, ghsa-37cx-329c-33x3, ghsa-89xv-2j6f-qhc8, ghsa-f6x5-jh6r-wrfv, ghsa-gm2x-2g9h-ccm8, ghsa-j5w8-q4qc-rx2x, ghsa-jhf3-xxhw-2wpp, ghsa-p436-gjf2-799p, ghsa-q382-vc8q-7jhj, ghsa-q9hv-hpm4-hj6x, ghsa-wvj2-96wp-fq3f, ghsa-xw59-hvm2-8pj6 applied in versions: 0.9.7-r1, 0.9.8-r0",
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CVE-2025-15558 (GCVE-0-2025-15558)
Vulnerability from cvelistv5 – Published: 2026-03-04 16:14 – Updated: 2026-03-05 04:55
VLAI
EPSS
Title
Docker Desktop Docker Plugins Uncontrolled Search Path Element Local Privilege Escalation Vulnerability
Summary
Docker CLI for Windows searches for plugin binaries in C:\ProgramData\Docker\cli-plugins, a directory that does not exist by default. A low-privileged attacker can create this directory and place malicious CLI plugin binaries (docker-compose.exe, docker-buildx.exe, etc.) that are executed when a victim user opens Docker Desktop or invokes Docker CLI plugin features, and allow privilege-escalation if the docker CLI is executed as a privileged user.
This issue affects Docker CLI: through 29.1.5 and Windows binaries acting as a CLI-plugin manager using the github.com/docker/cli/cli-plugins/manager https://pkg.go.dev/github.com/docker/cli@v29.1.5+incompatible/cli-plugins/manager package, such as Docker Compose.
This issue does not impact non-Windows binaries, and projects not using the plugin-manager code.
Severity
CWE
- CWE-427 - Uncontrolled Search Path Element
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://docs.docker.com/desktop/release-notes/ | |
| https://www.zerodayinitiative.com/advisories/ZDI-… | third-party-advisory |
| https://github.com/docker/cli/pull/6713 | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Docker | Docker CLI |
Unaffected:
29.2.0
(semver)
|
|
| Docker | Compose |
Unaffected:
5.1.0
(semver)
|
Credits
Nitesh Surana (niteshsurana.com) of Trend Research of TrendAI
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CVE-2026-1229 (GCVE-0-2026-1229)
Vulnerability from cvelistv5 – Published: 2026-02-24 07:58 – Updated: 2026-02-24 15:10
VLAI
EPSS
Title
Incorrect calculation in CIRCL secp384r1 CombinedMult
Summary
The CombinedMult function in the CIRCL ecc/p384 package (secp384r1 curve) produces an incorrect value for specific inputs. The issue is fixed by using complete addition formulas.
ECDH and ECDSA signing relying on this curve are not affected.
The bug was fixed in v1.6.3 https://github.com/cloudflare/circl/releases/tag/v1.6.3 .
Severity
CWE
- CWE-682 - Incorrect Calculation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/cloudflare/circl |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cloudflare | CIRCL |
Affected:
CIRCL up to version 1.6.2 , < 1.6.3
(custom)
|
Credits
Guido Vranken
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CVE-2026-25934 (GCVE-0-2026-25934)
Vulnerability from cvelistv5 – Published: 2026-02-09 22:13 – Updated: 2026-02-11 21:23
VLAI
EPSS
Title
go-git improperly verifies data integrity values for .idx and .pack files
Summary
go-git is a highly extensible git implementation library written in pure Go. Prior to 5.16.5, a vulnerability was discovered in go-git whereby data integrity values for .pack and .idx files were not properly verified. This resulted in go-git potentially consuming corrupted files, which would likely result in unexpected errors such as object not found. For context, clients fetch packfiles from upstream Git servers. Those files contain a checksum of their contents, so that clients can perform integrity checks before consuming it. The pack indexes (.idx) are generated locally by go-git, or the git cli, when new .pack files are received and processed. The integrity checks for both files were not being verified correctly. This vulnerability is fixed in 5.16.5.
Severity
4.3 (Medium)
CWE
- CWE-354 - Improper Validation of Integrity Check Value
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/go-git/go-git/security/advisor… | x_refsource_CONFIRM |
| https://github.com/go-git/go-git/releases/tag/v5.16.5 | x_refsource_MISC |
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CVE-2026-27896 (GCVE-0-2026-27896)
Vulnerability from cvelistv5 – Published: 2026-02-26 00:47 – Updated: 2026-02-26 17:06
VLAI
EPSS
Title
MCP Go SDK Vulnerable to Improper Handling of Case Sensitivity
Summary
The Go MCP SDK used Go's standard encoding/json.Unmarshal for JSON-RPC and MCP protocol message parsing in versions prior to 1.3.1. Go's standard library performs case-insensitive matching of JSON keys to struct field tags — a field tagged json:"method" would also match "Method", "METHOD", etc. This violated the JSON-RPC 2.0 specification, which defines exact field names. A malicious MCP peer may have been able to send protocol messages with non-standard field casing that the SDK would silently accept. This had the potential for bypassing intermediary inspection and coss-implementation inconsistency. Go's standard JSON unmarshaling was replaced with a case-sensitive decoder in commit 7b8d81c. Users are advised to update to v1.3.1 to resolve this issue.
Severity
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/modelcontextprotocol/go-sdk/se… | x_refsource_CONFIRM |
| https://github.com/modelcontextprotocol/go-sdk/co… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| modelcontextprotocol | go-sdk |
Affected:
< 1.3.1
|
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CVE-2026-33252 (GCVE-0-2026-33252)
Vulnerability from cvelistv5 – Published: 2026-03-23 23:44 – Updated: 2026-03-24 18:39
VLAI
EPSS
Title
MCP Go SDK Allows Cross-Site Tool Execution for HTTP Servers without Authorizatrion
Summary
The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.1, the Go SDK's Streamable HTTP transport accepted browser-generated cross-site `POST` requests without validating the `Origin` header and without requiring `Content-Type: application/json`. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution. Version 1.4.1 contains a patch for the issue.
Severity
7.1 (High)
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/modelcontextprotocol/go-sdk/se… | x_refsource_CONFIRM |
| https://github.com/modelcontextprotocol/go-sdk/co… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| modelcontextprotocol | go-sdk |
Affected:
< 1.4.1
|
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CVE-2026-33762 (GCVE-0-2026-33762)
Vulnerability from cvelistv5 – Published: 2026-03-31 13:47 – Updated: 2026-03-31 18:53
VLAI
EPSS
Title
go-git: Missing validation decoding Index v4 files leads to panic
Summary
go-git is an extensible git implementation library written in pure Go. Prior to version 5.17.1, go-git’s index decoder for format version 4 fails to validate the path name prefix length before applying it to the previously decoded path name. A maliciously crafted index file can trigger an out-of-bounds slice operation, resulting in a runtime panic during normal index parsing. This issue only affects Git index format version 4. Earlier formats (go-git supports only v2 and v3) are not vulnerable to this issue. This issue has been patched in version 5.17.1.
Severity
CWE
- CWE-129 - Improper Validation of Array Index
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/go-git/go-git/security/advisor… | x_refsource_CONFIRM |
| https://github.com/go-git/go-git/releases/tag/v5.17.1 | x_refsource_MISC |
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CVE-2026-34165 (GCVE-0-2026-34165)
Vulnerability from cvelistv5 – Published: 2026-03-31 13:46 – Updated: 2026-04-02 15:10
VLAI
EPSS
Title
go-git: Maliciously crafted idx file can cause asymmetric memory consumption
Summary
go-git is an extensible git implementation library written in pure Go. From version 5.0.0 to before version 5.17.1, a vulnerability has been identified in which a maliciously crafted .idx file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a denial-of-service (DoS) condition. Exploitation requires write access to the local repository's .git directory, it order to create or alter existing .idx files. This issue has been patched in version 5.17.1.
Severity
5 (Medium)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/go-git/go-git/security/advisor… | x_refsource_CONFIRM |
| https://github.com/go-git/go-git/releases/tag/v5.17.1 | x_refsource_MISC |
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CVE-2026-34742 (GCVE-0-2026-34742)
Vulnerability from cvelistv5 – Published: 2026-04-02 18:32 – Updated: 2026-04-03 15:59
VLAI
EPSS
Title
Model Context Protocol Go SDK: DNS Rebinding Protection Disabled by Default for Servers Running on Localhost
Summary
The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.0, the Model Context Protocol (MCP) Go SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication with StreamableHTTPHandler or SSEHandler, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances. This issue has been patched in version 1.4.0.
Severity
CWE
- CWE-1188 - Insecure Default Initialization of Resource
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/modelcontextprotocol/go-sdk/se… | x_refsource_CONFIRM |
| https://github.com/modelcontextprotocol/go-sdk/pull/760 | x_refsource_MISC |
| https://github.com/modelcontextprotocol/go-sdk/co… | x_refsource_MISC |
| https://github.com/modelcontextprotocol/go-sdk/re… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| modelcontextprotocol | go-sdk |
Affected:
< 1.4.0
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-34742",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-03T15:58:40.335119Z",
"version": "2.0.3"
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"providerMetadata": {
"dateUpdated": "2026-04-03T15:59:37.091Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "go-sdk",
"vendor": "modelcontextprotocol",
"versions": [
{
"status": "affected",
"version": "\u003c 1.4.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "The Go MCP SDK used Go\u0027s standard encoding/json. Prior to version 1.4.0, the Model Context Protocol (MCP) Go SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication with StreamableHTTPHandler or SSEHandler, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances. This issue has been patched in version 1.4.0."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 7.6,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1188",
"description": "CWE-1188: Insecure Default Initialization of Resource",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-02T18:32:34.781Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-xw59-hvm2-8pj6",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-xw59-hvm2-8pj6"
},
{
"name": "https://github.com/modelcontextprotocol/go-sdk/pull/760",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/modelcontextprotocol/go-sdk/pull/760"
},
{
"name": "https://github.com/modelcontextprotocol/go-sdk/commit/67bd3f2e2b53ce11a16db8d976cdb8ff1e986b6d",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/modelcontextprotocol/go-sdk/commit/67bd3f2e2b53ce11a16db8d976cdb8ff1e986b6d"
},
{
"name": "https://github.com/modelcontextprotocol/go-sdk/releases/tag/v1.4.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/modelcontextprotocol/go-sdk/releases/tag/v1.4.0"
}
],
"source": {
"advisory": "GHSA-xw59-hvm2-8pj6",
"discovery": "UNKNOWN"
},
"title": "Model Context Protocol Go SDK: DNS Rebinding Protection Disabled by Default for Servers Running on Localhost"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-34742",
"datePublished": "2026-04-02T18:32:34.781Z",
"dateReserved": "2026-03-30T19:17:10.224Z",
"dateUpdated": "2026-04-03T15:59:37.091Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
GHSA-37CX-329C-33X3
Vulnerability from github – Published: 2026-02-10 00:28 – Updated: 2026-02-10 02:57
VLAI
Summary
go-git improperly verifies data integrity values for .idx and .pack files
Details
Impact
A vulnerability was discovered in go-git whereby data integrity values for .pack and .idx files were not properly verified. This resulted in go-git potentially consuming corrupted files, which would likely result in unexpected errors such as object not found.
For context, clients fetch packfiles from upstream Git servers. Those files contain a checksum of their contents, so that clients can perform integrity checks before consuming it. The pack indexes (.idx) are generated locally by go-git, or the git cli, when new .pack files are received and processed. The integrity checks for both files were not being verified correctly.
Note that the lack of verification of the packfile checksum has no impact on the trust relationship between the client and server, which is enforced based on the protocol being used (e.g. TLS in the case of https:// or known hosts for ssh://). In other words, the packfile checksum verification does not provide any security benefits when connecting to a malicious or compromised Git server.
Patches
Users should upgrade to v5.16.5, or the latest v6 pseudo-version, in order to mitigate this vulnerability.
Workarounds
In case updating to a fixed version of go-git is not possible, users can run git fsck from the git cli to check for data corruption on a given repository.
Credit
Thanks @N0zoM1z0 for finding and reporting this issue privately to the go-git project.
Severity
4.3 (Medium)
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 5.16.4"
},
"package": {
"ecosystem": "Go",
"name": "github.com/go-git/go-git/v5"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.16.5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-25934"
],
"database_specific": {
"cwe_ids": [
"CWE-354"
],
"github_reviewed": true,
"github_reviewed_at": "2026-02-10T00:28:53Z",
"nvd_published_at": "2026-02-09T23:16:05Z",
"severity": "MODERATE"
},
"details": "### Impact \n\nA vulnerability was discovered in `go-git` whereby data integrity values for `.pack` and `.idx` files were not properly verified. This resulted in `go-git` potentially consuming corrupted files, which would likely result in unexpected errors such as `object not found`.\n\nFor context, clients fetch [`packfiles`](https://git-scm.com/docs/pack-protocol#_packfile_data) from upstream Git servers. Those files contain a checksum of their contents, so that clients can perform integrity checks before consuming it. The pack indexes (`.idx`) are [generated](https://git-scm.com/docs/pack-format) locally by `go-git`, or the `git` cli, when new `.pack` files are received and processed. The integrity checks for both files were not being verified correctly.\n\nNote that the lack of verification of the packfile checksum has no impact on the trust relationship between the client and server, which is enforced based on the protocol being used (e.g. TLS in the case of `https://` or known hosts for `ssh://`). In other words, the packfile checksum verification does not provide any security benefits when connecting to a malicious or compromised Git server.\n\n### Patches\n\nUsers should upgrade to `v5.16.5`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability.\n\n### Workarounds\n\nIn case updating to a fixed version of `go-git` is not possible, users can run [git fsck](https://git-scm.com/docs/git-fsck) from the `git` cli to check for data corruption on a given repository. \n\n### Credit\n\nThanks @N0zoM1z0 for finding and reporting this issue privately to the `go-git` project.",
"id": "GHSA-37cx-329c-33x3",
"modified": "2026-02-10T02:57:13Z",
"published": "2026-02-10T00:28:53Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/go-git/go-git/security/advisories/GHSA-37cx-329c-33x3"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25934"
},
{
"type": "PACKAGE",
"url": "https://github.com/go-git/go-git"
},
{
"type": "WEB",
"url": "https://github.com/go-git/go-git/releases/tag/v5.16.5"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
}
],
"summary": "go-git improperly verifies data integrity values for .idx and .pack files"
}
GHSA-89XV-2J6F-QHC8
Vulnerability from github – Published: 2026-03-19 16:42 – Updated: 2026-03-25 20:48
VLAI
Summary
Cross-Site Tool Execution for HTTP Servers without Authorizatrion in github.com/modelcontextprotocol/go-sdk
Details
The Go SDK's Streamable HTTP transport accepted browser-generated cross-site POST requests without validating the Origin header and without requiring Content-Type: application/json. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution.
Impact:
A malicious website may have been able to send cross-site POST requests with Content-Type: text/plain, which due to CORS-safelisted properties would reach the MCP message handling without any CORS preflight barrier.
Fix:
The SDK was modified to perform Content-Type header validation for POST requests and introduced a configurable protection for verifying the origin of the request in commit a433a83. Users are advised to update to v1.4.1 to use this additional protection.
Note: v1.4.1 requires Go 1.25 or later.
Credits:
Thank you to Lê Minh Quân for reporting the issue.
Severity
7.1 (High)
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 1.4.0"
},
"package": {
"ecosystem": "Go",
"name": "github.com/modelcontextprotocol/go-sdk"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.4.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-33252"
],
"database_specific": {
"cwe_ids": [
"CWE-352"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-19T16:42:40Z",
"nvd_published_at": "2026-03-24T00:16:30Z",
"severity": "HIGH"
},
"details": "The Go SDK\u0027s Streamable HTTP transport accepted browser-generated cross-site `POST` requests without validating the `Origin` header and without requiring `Content-Type: application/json`. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution.\n\n#### Impact:\n\nA malicious website may have been able to send cross-site POST requests with `Content-Type: text/plain`, which due to CORS-safelisted properties would reach the MCP message handling without any CORS preflight barrier.\n\n#### Fix:\n\nThe SDK was modified to perform `Content-Type` header validation for POST requests and introduced a configurable protection for verifying the origin of the request in commit a433a83. Users are advised to update to v1.4.1 to use this additional protection.\n\nNote: v1.4.1 requires Go 1.25 or later.\n\n#### Credits:\n\nThank you to L\u00ea Minh Qu\u00e2n for reporting the issue.",
"id": "GHSA-89xv-2j6f-qhc8",
"modified": "2026-03-25T20:48:22Z",
"published": "2026-03-19T16:42:40Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-89xv-2j6f-qhc8"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33252"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/go-sdk/commit/a433a831d6e5d5ac3b9e625a8095aa8eaa040dfc"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/go-sdk"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L",
"type": "CVSS_V3"
}
],
"summary": "Cross-Site Tool Execution for HTTP Servers without Authorizatrion in github.com/modelcontextprotocol/go-sdk"
}
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Trend slope:
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(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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