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CVE-2025-8734: GNU Bison scan-code.c code_free double free

lowCVSS 3.3CVE-2025-8734

CSIRTS triage

vendor: GNUproduct: BisonMemory corruption
What
Double free vulnerability in scan-code.c code_free function.
Who is affected
Systems using GNU Bison to process grammar files with vulnerable Bison versions.
Urgency
Low severity (CVSS 3.3) and not exploited; limited practical impact in typical usage.
Action
Update to patched Bison version that removes the double free in code_free.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
low — CVSS 3.3
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-8734

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-8734coverage & exploitation statusNVD · CVE.org

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