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Vulnerabilities

Vulnerability · CVE-2025-61729

crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate

Published Oct 16, 2026 · Red Hat

Check if you run it

No confirmed exploitation is on record for CVE-2025-61729. EPSS is 0.46%. Act only if a listed version of Red Hat is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.46%
Remediation
Fix linked
Affected products
Red Hat

A flaw was found in golang. A remote attacker could exploit this vulnerability by providing a specially crafted certificate during the error string construction process within the function. This flaw, caused by unbounded string concatenation, leads to excessive resource consumption. Successful exploitation can result in a denial of service (DoS) for the affected system.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2025-61729

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-61729. EPSS is 0.46%. Act only if a listed version of Red Hat is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.46%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Related Odoo Git fixes

Quoted Community commit messages that cite this CVE. Presence of a commit is not proof that every edition or backport includes the fix. Enterprise proprietary diffs are never shown here. Timeline

  • Dec 2, 2025 · referenced

    update to go1.25.5

    update to go1.25.5 These releases include 2 security fixes following the security policy: - crypto/x509: excessive resource consumption in printing error string for host certificate validation Within HostnameError.Error(), when constructing an error string, there is no limit to the number of hosts that will be printed out. Furthermore, the error string is constructed by repeated string concatenation, leading to quadratic runtime. Therefore, a certificate provided by a malicious actor can result in excessive resource consumption. HostnameError.Error() now limits the number of hosts and utilizes strings.Builder when constructing an error string. Thanks to Philippe Antoine (Catena cyber) for reporting this issue. This is CVE-2025-61729 and Go issue https://go.dev/issue/76445. - crypto/x509: excluded subdomain constraint does not restrict wildcard SANs An excluded subdomain c…
    https://github.com/moby/moby/commit/6f9d1ec3fb8ca4dbbedb1ed91020d9190dd0d848

Timeline

Detection, updates, and resolution for this record.

  1. Oct 16, 2026 · CSAF Advisories

    Detected

    A flaw was found in golang. A remote attacker could exploit this vulnerability by providing a specially crafted certificate during the error string construction process within the function. This flaw, caused by unbounded string concatenation, leads to excessive resource consumption. Successful exploitation can result in a denial of service (DoS) for the affected system.

Sources

  • CSAF AdvisoriesVendor advisoryRHSA-2026:9848:CVE-2025-61729

    A flaw was found in golang. A remote attacker could exploit this vulnerability by providing a specially crafted certificate during the error string construction process within the function. This flaw, caused by unbounded string concatenation, leads to excessive resource consumpti

    security.access.redhat.com
  • CVE.orgVulnerability recordCVE-2025-61729

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-61729

    30-day exploitation probability 0.5%

    first.org

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.