RHSA-2026:51057
Vulnerability from csaf_redhat - Published: 2026-08-06 11:09 - Updated: 2026-08-12 05:34A flaw was found in the `crypto/x509` package of `golang`. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name (SAN) entries. The certificate verification process, specifically the `VerifyHostname` function, incurs excessive computational overhead due to repeated string operations when processing these entries. This can lead to a significant performance degradation or unresponsiveness of systems validating such certificates.
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:165efe95829019cfa2262f929dce52ea95ff83ce495309726aad336fbdd5e346_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:1fa54de6f9a2b2637715ba73efae4cd31eb2be55121ffdf33306d2cafc7cbdd3_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:3891a8717d05c5fd308ed4b3b09d53b793f5bddfadc365f7c07e597b5a14ce4d_arm64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:f3f19ccbae2990e1b0b5c366f880b1c1eb2a5f7515a4017f4fe6c9b089bf27d0_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:2a8a7fcaf8cb0acc0a2a66a46338887ca8a9823adc1d5fe29f2440560895ff7e_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:c2321623908f1bbc2b353b7fd50cf30835511ef2715b00df1362edca3c8476a3_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:da07963beb33a34655d8aa1bf7c9b37b2c63d572d2689cf934243da5a2578573_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:fc22e7614d51d5a1f809cdea32979acec0e05361cdfd94ac773d269f473e6860_arm64 | — |
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A flaw was found in the `net` package of Go (golang), specifically when using the `LookupCNAME` function with the `cgo` DNS resolver. A remote attacker could exploit this by providing a very long Canonical Name (CNAME) response. This can trigger a double-free of C memory, leading to a crash and a Denial of Service (DoS) for the affected application.
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:165efe95829019cfa2262f929dce52ea95ff83ce495309726aad336fbdd5e346_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:1fa54de6f9a2b2637715ba73efae4cd31eb2be55121ffdf33306d2cafc7cbdd3_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:3891a8717d05c5fd308ed4b3b09d53b793f5bddfadc365f7c07e597b5a14ce4d_arm64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:f3f19ccbae2990e1b0b5c366f880b1c1eb2a5f7515a4017f4fe6c9b089bf27d0_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:2a8a7fcaf8cb0acc0a2a66a46338887ca8a9823adc1d5fe29f2440560895ff7e_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:c2321623908f1bbc2b353b7fd50cf30835511ef2715b00df1362edca3c8476a3_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:da07963beb33a34655d8aa1bf7c9b37b2c63d572d2689cf934243da5a2578573_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:fc22e7614d51d5a1f809cdea32979acec0e05361cdfd94ac773d269f473e6860_arm64 | — |
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A flaw was found in Moby, the open-source container framework, and Docker Engine. A malicious container image can exploit this vulnerability to achieve arbitrary code execution with full daemon privileges, including host root access. This occurs when a user uploads a compressed archive to the container, as the daemon incorrectly uses decompression binaries from the container's filesystem. This allows an attacker to gain complete control over the affected system.
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:165efe95829019cfa2262f929dce52ea95ff83ce495309726aad336fbdd5e346_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:1fa54de6f9a2b2637715ba73efae4cd31eb2be55121ffdf33306d2cafc7cbdd3_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:3891a8717d05c5fd308ed4b3b09d53b793f5bddfadc365f7c07e597b5a14ce4d_arm64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:f3f19ccbae2990e1b0b5c366f880b1c1eb2a5f7515a4017f4fe6c9b089bf27d0_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:2a8a7fcaf8cb0acc0a2a66a46338887ca8a9823adc1d5fe29f2440560895ff7e_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:c2321623908f1bbc2b353b7fd50cf30835511ef2715b00df1362edca3c8476a3_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:da07963beb33a34655d8aa1bf7c9b37b2c63d572d2689cf934243da5a2578573_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:fc22e7614d51d5a1f809cdea32979acec0e05361cdfd94ac773d269f473e6860_arm64 | — |
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A flaw was found in the Moby container framework. A race condition occurs during the `docker cp` mount setup, which a malicious container can exploit. This vulnerability allows the container to redirect a bind mount target to an arbitrary path on the host system. Consequently, an attacker could overwrite host files, potentially leading to data corruption or a denial of service.
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:165efe95829019cfa2262f929dce52ea95ff83ce495309726aad336fbdd5e346_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:1fa54de6f9a2b2637715ba73efae4cd31eb2be55121ffdf33306d2cafc7cbdd3_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:3891a8717d05c5fd308ed4b3b09d53b793f5bddfadc365f7c07e597b5a14ce4d_arm64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:f3f19ccbae2990e1b0b5c366f880b1c1eb2a5f7515a4017f4fe6c9b089bf27d0_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:2a8a7fcaf8cb0acc0a2a66a46338887ca8a9823adc1d5fe29f2440560895ff7e_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:c2321623908f1bbc2b353b7fd50cf30835511ef2715b00df1362edca3c8476a3_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:da07963beb33a34655d8aa1bf7c9b37b2c63d572d2689cf934243da5a2578573_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:fc22e7614d51d5a1f809cdea32979acec0e05361cdfd94ac773d269f473e6860_arm64 | — |
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A flaw was found in the Golang MIME (Multipurpose Internet Mail Extensions) package. A remote attacker could exploit this vulnerability by sending a maliciously-crafted MIME header containing many invalid encoded-words. This could lead to excessive CPU consumption, resulting in a Denial of Service (DoS) for the affected system.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:165efe95829019cfa2262f929dce52ea95ff83ce495309726aad336fbdd5e346_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:1fa54de6f9a2b2637715ba73efae4cd31eb2be55121ffdf33306d2cafc7cbdd3_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:3891a8717d05c5fd308ed4b3b09d53b793f5bddfadc365f7c07e597b5a14ce4d_arm64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:f3f19ccbae2990e1b0b5c366f880b1c1eb2a5f7515a4017f4fe6c9b089bf27d0_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:2a8a7fcaf8cb0acc0a2a66a46338887ca8a9823adc1d5fe29f2440560895ff7e_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:c2321623908f1bbc2b353b7fd50cf30835511ef2715b00df1362edca3c8476a3_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:da07963beb33a34655d8aa1bf7c9b37b2c63d572d2689cf934243da5a2578573_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.2:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:fc22e7614d51d5a1f809cdea32979acec0e05361cdfd94ac773d269f473e6860_arm64 | — |
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"text": "A flaw was found in the `crypto/x509` package of `golang`. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name (SAN) entries. The certificate verification process, specifically the `VerifyHostname` function, incurs excessive computational overhead due to repeated string operations when processing these entries. This can lead to a significant performance degradation or unresponsiveness of systems validating such certificates.",
"title": "Vulnerability description"
},
{
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"text": "crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A flaw was found in the Go standard library crypto/x509 package. When verifying a TLS certificate hostname, VerifyHostname processed each DNS Subject Alternative Name (SAN) entry in a loop and repeatedly split the candidate hostname on \".\" characters. For certificates with a very large DNS SAN list, CPU use could grow quadratically with the number of SAN entries and hostname labels. Because hostname verification runs before the certificate chain is built, this overhead can occur even when the certificate is not trusted.\n\nRed Hat rates this issue as Important. It affects Red Hat products that include the Go standard library crypto/x509 code from an affected Go toolchain version (before Go 1.25.11, or from Go 1.26.0 through Go 1.26.3). Applications and container images built with a fixed Go release (1.25.11 or later, or 1.26.4 or later) are not affected. Community distributions such as Fedora are also affected.\n\nUpstream fix: Go 1.25.11 and Go 1.26.4 (GO-2026-5037).",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"title": "crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries"
},
{
"cve": "CVE-2026-33811",
"cwe": {
"id": "CWE-1341",
"name": "Multiple Releases of Same Resource or Handle"
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"text": "2467822"
}
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{
"category": "description",
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"title": "Vulnerability description"
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"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service vulnerability in the Go `net` package, affecting applications configured to use the `cgo` DNS resolver. A remote attacker could trigger a double-free memory error by providing a very long CNAME response, leading to a crash of the vulnerable application and impacting service availability.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header"
}
]
}
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.