PT-2026-50650 · Rui314 · 8Cc

Marcin Wyczechowski + 1 · Published 2026-06-18 · Updated 2026-06-18 · CVE-2026-50643

Mitre

CVSS v4.0

5.1

Medium

Base vector

AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

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.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-50643

Affected Products

8Cc

References · 2

• https://cert.pl/en/posts/2026/06/CVE-2026-50641 · Note
• https://github.com/rui314/8cc · Note