CVE-2026-55777Public exploitNetwork attack vector

Remote crash via offset-sized iOS User-Agent copy

Published Jul 30, 2026 · Updated Jul 30, 2026

Out-of-bounds read in GoAccess before 1.11 allows remote attackers to crash log analysis via a crafted User-Agent in a processed access log. In parse_ios(), memmove uses the attacker-controlled keyword-to-OS offset as both its source offset and copy length, reading up to about 4 KB beyond the heap allocation. A single unauthenticated HTTP request reaches the flaw only when its logged User-Agent is later parsed; default User-Agent-bearing formats expose a conditional process crash, not reportable memory disclosure.

CVSS severity5.3
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in GoAccess before 1.11 allows remote attackers to crash log analysis via a crafted User-Agent in a processed access log. In parse_ios(), memmove uses the attacker-controlled keyword-to-OS offset as both its source offset and copy length, reading up to about 4 KB beyond the heap allocation. A single unauthenticated HTTP request reaches the flaw only when its logged User-Agent is later parsed; default User-Agent-bearing formats expose a conditional process crash, not reportable memory disclosure.

The record

CVE
CVE-2026-55777
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
allinurl
Product
GoAccess
Classifications
CWE-125, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

allinurl · GoAccessversion=< 1.11

Published CVSS scores

5.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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