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VulnerabilityPublished

CVE-2026-97054: Go standard library net/http · Missing Synchronization

Affects Go standard library net/httpSource CVE Database V5

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Not known to be exploited : upgrade to 1.27.4 or 1.26.11 when convenient.

Data as of 11 Nov 2026, 03:33 UTC

Severity
Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 1.27.4, 1.26.11

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Nov 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 Go standard library net/http to 1.27.4 or 1.26.11.

Affected software

ProductAffectedFixed in
Go standard librarynet/httpAffected
  • >=1.27.0-0 <1.27.4
Fixed in
  • 1.27.4
Go standard librarynet/httpAffected
  • <1.26.11
Fixed in
  • 1.26.11
Gonet/httppkg:golang/net/httpOther threatsAffected
  • <1.26.11
  • >=1.27.0-0 <1.27.4
Fixed in
  • 1.26.11
  • 1.27.4

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

Description

For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.

References

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