Bug 2509603 (CVE-2026-55777)

Summary: CVE-2026-55777 goaccess: GoAccess: Denial of Service via crafted User-Agent
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in GoAccess. A remote attacker can craft a malicious User-Agent string in an access log. The `parse_ios()` function, which processes log data, incorrectly uses an attacker-controlled offset. This can lead to an out-of-bounds heap read, causing the application to crash and resulting in a denial of service (DoS).
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Bug Depends On: 2509797, 2509799    
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Description OSIDB Bzimport 2026-07-30 21:02:43 UTC 
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.