Is CVE-2026-109831 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-109831 being exploited in the wild.

How severe is CVE-2026-109831?

Medium severity, with a CVSS score of 5.4, published 20 October 2026.

Which products and versions are affected?

GNU Project UnRTF prior to 0.21.12.

Is there a fix for CVE-2026-109831?

Yes: fixed in 0.21.12. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-109831 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-109831?

Check whether you run GNU Project UnRTF 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.

CVE-2026-109831: UnRTF out-of-bounds write

CVE-2026-109831 · Severity: medium · CVSS 5.4 · Published 2026-10-20

UnRTF is a document converter that transforms Rich Text Format (RTF) files into other formats. A crafted RTF file can trigger an out-of-bounds write vulnerability, causing the application to crash and denying users access to the conversion service or potentially corrupting data.

Vendors: GNU Project.

Quick answers

Is CVE-2026-109831 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-109831 being exploited in the wild.
How severe is CVE-2026-109831?: Medium severity, with a CVSS score of 5.4, published 20 October 2026.
Which products and versions are affected?: GNU Project UnRTF prior to 0.21.12.
Is there a fix for CVE-2026-109831?: Yes: fixed in 0.21.12. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-109831 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-109831?: Check whether you run GNU Project UnRTF 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.

How to fix

Fixed in: 0.21.12

Technical details

UnRTF contains an out-of-bounds write vulnerability (CWE-787) triggered by parsing maliciously crafted RTF files. The attack requires user interaction (opening a malicious RTF file) over the network. Successful exploitation results in denial-of-service through application crash and potential data integrity issues.

Affected products

GNU Project UnRTF prior to 0.21.12

Timeline

2026-10-20: disclosed
2026-08-24: patched: UnRTF 0.21.12 released

References

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