https://seclists.org/oss-sec/2026/q3/627: libksba-1.8.1 fixes a possible CMS parser infinite loop

Q: Which parsing paths are affected?

The fix changes the CMS signed-data and enveloped-data parsing paths, specifically the functions that parse signed data part 2 and enveloped data part 1.

Q: What input condition triggers the issue?

The issue occurs when the CMS parser detects no progress while processing affected data. Before the fix, this condition could result in an infinite loop.

Q: Which release contains the fix?

libksba 1.8.1 contains the CMS parser fix. The change is commit 06720f9b16a172404f49089cbb6eb95e4344f562.

Published Aug 31, 2026

Updated

Affected Software

1 affected component

gnupg Libksba<1.8.1

Frequently Asked Questions

Which parsing paths are affected?

The fix changes the CMS signed-data and enveloped-data parsing paths, specifically the functions that parse signed data part 2 and enveloped data part 1.

What input condition triggers the issue?

The issue occurs when the CMS parser detects no progress while processing affected data. Before the fix, this condition could result in an infinite loop.

Which release contains the fix?

libksba 1.8.1 contains the CMS parser fix. The change is commit 06720f9b16a172404f49089cbb6eb95e4344f562.