CVE-2026-55777

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

MEDIUM
5.3
CVSS Score
Published: July 30, 2026 at 08:37 PM UTC
Updated: October 23, 2026 at 10:10 PM UTC
1 product affected across 1 vendorGoaccess

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.4%
SSVC
PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.11
Affected range stops below 1.11, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-125

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