CVE-2026-42507 (GCVE-0-2026-42507)
Vulnerability from cvelistv5 – Published: 2026-06-02 22:01 – Updated: 2026-06-03 19:04
VLAI
EPSS
VEX
Title
Arbitrary inputs are included in errors without any escaping in net/textproto
Summary
When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-03 19:04 UTC
CWE
- CWE-532 - Insertion of Sensitive Information into Log File
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Go standard library | net/textproto |
Affected:
0 , < 1.25.11
(semver)
Affected: 1.26.0-0 , < 1.26.4 (semver) |
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-42507",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-03T19:04:08.223332Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-03T19:04:45.361Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "net/textproto",
"product": "net/textproto",
"programRoutines": [
{
"name": "parseCodeLine"
},
{
"name": "Reader.ReadCodeLine"
},
{
"name": "readMIMEHeader"
},
{
"name": "Error.Error"
},
{
"name": "Reader.ReadMIMEHeader"
},
{
"name": "Reader.ReadResponse"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.25.11",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.4",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-532: Insertion of Sensitive Information into Log File",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-02T22:01:37.307Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/79346"
},
{
"url": "https://go.dev/cl/777060"
},
{
"url": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-5039"
}
],
"title": "Arbitrary inputs are included in errors without any escaping in net/textproto"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-42507",
"datePublished": "2026-06-02T22:01:37.307Z",
"dateReserved": "2026-04-28T00:21:12.792Z",
"dateUpdated": "2026-06-03T19:04:45.361Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-42507",
"date": "2026-09-15",
"epss": "0.0037",
"percentile": "0.30529"
},
"microsoft_vex": {
"current_release_date": "2026-09-09T14:48:05.000Z",
"cve": "CVE-2026-42507",
"id": "msrc_CVE-2026-42507",
"initial_release_date": "2026-06-05T01:02:17.000Z",
"product_status:fixed": "3",
"product_status:known_affected": "7",
"product_status:known_not_affected": "3",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "Arbitrary inputs are included in errors without any escaping in net/textproto",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-42507.json",
"version": "9"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-42507\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2026-06-02T23:16:38.027\",\"lastModified\":\"2026-07-22T19:10:00.120\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged.\"},{\"lang\":\"es\",\"value\":\"Al devolver errores, las funciones en el paquete net/textproto incluir\u00edan su entrada como parte del error. Esto podr\u00eda permitir a un atacante inyectar contenido enga\u00f1oso en errores que son impresos o registrados.\"}],\"affected\":[{\"source\":\"security@golang.org\",\"affectedData\":[{\"vendor\":\"Go standard library\",\"product\":\"net/textproto\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://pkg.go.dev\",\"packageName\":\"net/textproto\",\"programRoutines\":[{\"name\":\"parseCodeLine\"},{\"name\":\"Reader.ReadCodeLine\"},{\"name\":\"readMIMEHeader\"},{\"name\":\"Error.Error\"},{\"name\":\"Reader.ReadMIMEHeader\"},{\"name\":\"Reader.ReadResponse\"}],\"versions\":[{\"version\":\"0\",\"lessThan\":\"1.25.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"1.26.0-0\",\"lessThan\":\"1.26.4\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-03T19:04:08.223332Z\",\"id\":\"CVE-2026-42507\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"references\":[{\"url\":\"https://go.dev/cl/777060\",\"source\":\"security@golang.org\"},{\"url\":\"https://go.dev/issue/79346\",\"source\":\"security@golang.org\"},{\"url\":\"https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw\",\"source\":\"security@golang.org\"},{\"url\":\"https://pkg.go.dev/vuln/GO-2026-5039\",\"source\":\"security@golang.org\"}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-08T13:35:34+00:00",
"cve": "CVE-2026-42507",
"id": "CVE-2026-42507",
"initial_release_date": "2026-06-02T22:01:37.307000+00:00",
"product_status:fixed": "214",
"product_status:known_affected": "384",
"product_status:known_not_affected": "181",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "net/textproto: golang: Golang net/textproto: Misleading error messages via input injection",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42507.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:22:42Z",
"cve": "CVE-2026-42507",
"id": "CVE-2026-42507",
"initial_release_date": "2026-06-04T02:24:03Z",
"product_status:known_affected": "24",
"product_status:known_not_affected": "97",
"product_status:recommended": "260",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-42507",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-42507.json",
"version": "10"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-42507\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-03T19:04:08.223332Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-03T19:04:38.365Z\"}}], \"cna\": {\"title\": \"Arbitrary inputs are included in errors without any escaping in net/textproto\", \"affected\": [{\"vendor\": \"Go standard library\", \"product\": \"net/textproto\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.25.11\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.26.0-0\", \"lessThan\": \"1.26.4\", \"versionType\": \"semver\"}], \"packageName\": \"net/textproto\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"parseCodeLine\"}, {\"name\": \"Reader.ReadCodeLine\"}, {\"name\": \"readMIMEHeader\"}, {\"name\": \"Error.Error\"}, {\"name\": \"Reader.ReadMIMEHeader\"}, {\"name\": \"Reader.ReadResponse\"}]}], \"references\": [{\"url\": \"https://go.dev/issue/79346\"}, {\"url\": \"https://go.dev/cl/777060\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-5039\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-532: Insertion of Sensitive Information into Log File\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-06-02T22:01:37.307Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-42507\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-03T19:04:45.361Z\", \"dateReserved\": \"2026-04-28T00:21:12.792Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-06-02T22:01:37.307Z\", \"assignerShortName\": \"Go\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…