Vulnerability · Published Jun 18, 2026 · Assigned by CERT-PL
CVE-2026-50643Out‑of‑Bounds Read in 8cc
Medium 5.1
In plain English
A medium-severity out-of-bounds read in 8cc from rui314. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Official description
8cc is vulnerable to an Out‑of‑Bounds Read due to improper handling of #line directives and GNU linemarkers. The compiler accepts attacker-controlled filename and line number metadata and later uses it without validation when accessing source line arrays. By supplying invalid or oversized line numbers, an attacker can trigger out-of-bounds memory access and a crash. Maintainer of this project was notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Version corresponding to the commit b480958 was tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
References
- https://cert.pl/en/posts/2026/06/CVE-2026-50641 third-party-advisory
- https://github.com/rui314/8cc product