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Advisory record · GHSA-jxpf-xq2m-q525

OpenMcdf has an Infinite loop DoS via crafted CFB directory cycle

CVSS 6.2 MediumEPSS 0.0019 · 8th percentile

Published by the GitHub Advisory Database at 22 Apr 2026, 22:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
OpenMcdfNuGet<3.1.33.1.3
Identifiers
GHSA-jxpf-xq2m-q525 · CVE-2026-41511
Weakness (CWE)
CWE-835
Tags
Published
22 Apr 2026
Updated
13 May 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of the NuGet package OpenMcdf before 3.1.3 are vulnerable to an infinite loop caused by a crafted Compound File Binary file containing a cycle in its directory entry sibling links. An attacker who can get an application to open an untrusted CFB file can make the calling thread loop indefinitely during enumeration or stream opening, causing a denial of service that exceptions cannot catch. Upgrade to OpenMcdf 3.1.3 or later.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.2 Medium 3.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0019, the 8th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:22 UTC First seen by agentprime
  2. 31 Oct 2026, 15:22 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.