Quick answers
- Is CVE-2026-38076 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-38076 being exploited in the wild.
- How severe is CVE-2026-38076?
- Informational severity, with a CVSS score of 5.5, published 9 July 2026.
- Which products and versions are affected?
- Artifex Software Jbig2dec Prior to commit cc37d09.
- Is there a fix for CVE-2026-38076?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-38076 attacked?
- It is attacked with local access or over the network, in a software library.
- Am I affected by CVE-2026-38076?
- Check whether you run Artifex Software Jbig2dec 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
An integer overflow vulnerability exists in the jbig2_arith_iaid_ctx_new() function within jbig2_arith_iaid.c of the jbig2dec library. The flaw is rooted in insufficient validation of the SBSYMCODELEN parameter, which triggers a signed integer overflow during the decoding loop in jbig2_arith_iaid_decode(). An attacker can exploit this by providing a malicious JBIG2 image file to a linked application (such as MuPDF), resulting in out-of-bounds memory access and a subsequent application crash. The issue was addressed in commit cc37d09.
Affected products
- Artifex Software jbig2dec Prior to commit cc37d09
- Artifex Software MuPDF
Timeline
- 2026-07-06: other: Vulnerability details shared via GitHub Gist
- 2026-07-09: disclosed: CVE published to NVD