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CVE-2025-8733: GNU Bison obprintf.c __obstack_vprintf_internal assertion

lowCVSS 3.3CVE-2025-8733

CSIRTS triage

vendor: GNUproduct: BisonDenial of service
What
GNU Bison obprintf.c __obstack_vprintf_internal function has an assertion that can be triggered causing a crash.
Who is affected
Systems using GNU Bison parser generator with malformed input or specific code generation scenarios.
Urgency
Low priority; denial of service limited to Bison processing with CVSS 3.3 and not actively exploited.
Action
Upgrade GNU Bison to a patched version that fixes CVE-2025-8733.

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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-2025-8733

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-8733coverage & exploitation statusNVD · CVE.org

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