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CVE-2026-56857VulnerabilityPublished Updated

SUSE · Security update for go1.27

Affects SUSESource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-56857· Critical 9.8

Not known to be exploited · CVSS 9.8 Critical : upgrade SUSE os to 1.27.2 or 1.26.9 as a priority.

Data as of 10 Nov 2026, 20:18 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 1.27.2, 1.26.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Upgrade os and internal/syscall/windows to 1.27.2 or 1.26.9.

Affected software

ProductAffectedFixed in
Go standard libraryosAffected
  • >=1.27.0-0 <1.27.2
Fixed in
  • 1.27.2
Go standard libraryosAffected
  • <1.26.9
Fixed in
  • 1.26.9
Go standard libraryinternal/syscall/windowsAffected
  • >=1.27.0-0 <1.27.2
Fixed in
  • 1.27.2
Go standard libraryinternal/syscall/windowsAffected
  • <1.26.9
Fixed in
  • 1.26.9
Goospkg:golang/osOther threatsAffected
  • <1.26.9
  • >=1.27.0-0 <1.27.2
Fixed in
  • 1.26.9
  • 1.27.2
Gointernal/syscall/windowspkg:golang/internal/syscall/windowsOther threatsAffected
  • <1.26.9
  • >=1.27.0-0 <1.27.2
Fixed in
  • 1.26.9
  • 1.27.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A security update to Go 1.27.2 is available that addresses all listed vulnerabilities. Users and administrators should upgrade to Go 1.27.2 to apply these fixes. No additional mitigation steps are indicated beyond applying this official update.

Description

This security update for Go 1.27 addresses multiple vulnerabilities across various packages including os, net/http, html/template, crypto/tls, and cmd/go. The fixes resolve issues such as directory traversal on Windows, HTTP/1 and HTTP/2 connection desynchronization, memory exhaustion, malformed header acceptance, checksum bypasses, and template context tracking errors. The update also includes numerous bug fixes to the compiler, runtime, and standard library packages. These vulnerabilities collectively pose risks of denial of service, memory corruption, and security bypasses.

References

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