CVE-2026-32877
Description
Botan is a C++ cryptography library. From version 2.3.0 to before version 3.11.0, during SM2 decryption, the code that checked the authentication code value (C3) failed to check that the encoded value was of the expected length prior to comparison. An invalid ciphertext can cause a heap over-read of up to 31 bytes, resulting in a crash or potentially other undefined behavior. This issue has been patched in version 3.11.0.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Mitigation details
CVE-2026-32877 NameCVE-2026-32877 DescriptionBotan is a C++ cryptography library. From version 2.3.0 to before version 3.11.0, during SM2 decryption, the code that checked the authentication code value (C3) failed to check that the encoded value was of the expected length prior to comparison. An invalid ciphertext can cause a heap over-read of up to 31 bytes, resulting in a crash or potentially…
CVE-2026-32877
| Name | CVE-2026-32877 |
| Description | Botan is a C++ cryptography library. From version 2.3.0 to before version 3.11.0, during SM2 decryption, the code that checked the authentication code value (C3) failed to check that the encoded value was of the expected length prior to comparison. An invalid ciphertext can cause a heap over-read of up to 31 bytes, resulting in a crash or potentially other undefined behavior. This issue has been patched in version 3.11.0. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| botan (PTS) | bullseye | 2.17.3+dfsg-2 | vulnerable |
| bookworm | 2.19.3+dfsg-1+deb12u1 | vulnerable | |
| trixie | 2.19.5+dfsg-4 | vulnerable | |
| botan3 (PTS) | trixie | 3.7.1+dfsg-2 | vulnerable |
| forky, sid | 3.12.0+dfsg-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| botan | source | (unstable) | (unfixed) | |||
| botan3 | source | experimental | 3.11.0+dfsg-1 | |||
| botan3 | source | (unstable) | 3.11.0+dfsg-2 |
Notes
https://github.com/randombit/botan/security/advisories/GHSA-7jj6-4r42-w9h6
https://github.com/randombit/botan/commit/f3c31f96f58f1d1d482032d8f4286dc9ebbc6712 (3.11.0)
Apply commands
https://github.com/randombit/botan/security/advisories/GHSA-7jj6-4r42-w9h6https://github.com/randombit/botan/commit/f3c31f96f58f1d1d482032d8f4286dc9ebbc6712 (3.11.0)OS impact
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Affected | — |
| sid | Fixed | 3.11.0+dfsg-2 |
| forky | Fixed | 3.11.0+dfsg-2 |
| bullseye | Affected | — |
| bookworm | Affected | — |
References
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.