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OpenAdvisories
Medium · 5.3 CVE-2026-55777 EUVD-2026-51306

GoAccess: Out-of-bounds heap read in parse_ios() via crafted User-Agent leads to remote crash/DoS

Published Jul 30, 2026 · Updated Jul 31, 2026 · Assigned by GitHub_M

Description

GoAccess is a real-time web log analyzer and interactive viewer that runs in a terminal in *nix systems or through the browser. Prior to 1.11, the parse_ios() function uses an attacker-controlled keyword-to-OS offset as both the source offset and copy length for memmove, allowing a crafted User-Agent in a processed access log to read up to approximately 4 KB beyond the heap allocation and conditionally crash GoAccess. This issue is fixed in version 1.11.

Affected products

VendorProductAffectedFixed
allinurl goaccess < 1.11 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 goaccess 1:1.11-1 —
Debian 13 goaccess 1:1.9.3-1+deb13u1 —
Debian 12 goaccess No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 goaccess No fix yet —
Ubuntu 26.04 LTS goaccess No fix yet —
Ubuntu 24.04 LTS goaccess No fix yet —
Ubuntu 22.04 LTS goaccess No fix yet —
Ubuntu 20.04 LTS goaccess No fix yet —
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 18.04 LTS goaccess No fix yet —
Ubuntu 16.04 LTS goaccess No fix yet —

References