# CVE-2026-55777: GoAccess out-of-bounds read in parse_ios function

Source: https://junglewise.ai/threats/cve-2026-55777-goaccess-out-of-bounds-read-in-parse-ios-function  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-30. Updated: 2026-07-30  
License: CC BY 4.0 with a link back

CVE-2026-55777 · Severity: info · CVSS 5.3 · Published 2026-07-30

GoAccess, a real-time web log analyzer, is vulnerable to a memory-handling error when processing specific mobile device information. An attacker can trigger this by sending a specially crafted web request to a server that is being monitored by GoAccess. If the malicious log entry is processed, it can cause the GoAccess application to crash, leading to a denial of service for administrators relying on the tool for real-time monitoring.

Technologies: [Allinurl GoAccess](https://junglewise.ai/threats/technologies/goaccess). Vendors: [Allinurl](https://junglewise.ai/threats/vendors/allinurl).

## Quick answers

**Is CVE-2026-55777 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-55777 being exploited in the wild.

**How severe is CVE-2026-55777?** Informational severity, with a CVSS score of 5.3, published 30 July 2026.

**Which products and versions are affected?** Allinurl GoAccess < 1.11.

**Is there a fix for CVE-2026-55777?** A patch was published on 2026-07-30: Fixed in version 1.11 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-55777 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-55777?** Check whether you run Allinurl GoAccess at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based out-of-bounds read exists in GoAccess prior to version 1.11 within the `parse_ios()` function in `src/opesys.c`. The vulnerability is caused by the incorrect use of an attacker-controlled offset as both the source offset and the copy length in a `memmove()` call. By providing a User-Agent string with excessive padding between an iOS keyword (e.g., iPhone) and the " OS " token, an attacker can cause the function to read up to 4 KB beyond the allocated heap buffer. While primarily resulting in a denial of service (SIGSEGV) when hitting unmapped memory or guard pages, it represents a significant spatial memory safety violation. The issue is reachable remotely if GoAccess is configured to analyze logs containing attacker-supplied User-Agent headers. This was fixed in version 1.11 by tightening the iOS version suffix parsing logic.

## Affected products

- allinurl GoAccess < 1.11

## Timeline

- 2026-07-20: advisory: GitHub Security Advisory published
- 2026-07-30: disclosed: CVE published to NVD
- 2026-07-30: patched: Fixed in version 1.11

## References

- [https://github.com/allinurl/goaccess/commit/ba813ed97d998dbdcb8d87e178799a4bb2da9e81](https://github.com/allinurl/goaccess/commit/ba813ed97d998dbdcb8d87e178799a4bb2da9e81)
- [https://github.com/allinurl/goaccess/security/advisories/GHSA-5phr-qpgf-hgrg](https://github.com/allinurl/goaccess/security/advisories/GHSA-5phr-qpgf-hgrg)

## Related threats

- [GoAccess integer truncation denial of service in WebSocket server](https://junglewise.ai/threats/cve-2026-55768-goaccess-integer-truncation-denial-of-service-in-websocket-server)
- [GoAccess heap-based buffer overflow in parse_browser](https://junglewise.ai/threats/cve-2026-54715-goaccess-heap-based-buffer-overflow-in-parse-browser)