CVE catalog
CVE-2026-10097
wolfSSL's AVX2-optimized ML-KEM implementation (mlkem_cmp_avx2) compares only 1536 of the 1568 ciphertext bytes during the Fujisaki-Okamoto re-encryption check in ML-KEM-1024 decapsulation. Ciphertext
- Severity
- High · CVSS 8.3
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.26% · Oct 25, 2026
wolfSSL's AVX2-optimized ML-KEM implementation (mlkem_cmp_avx2) compares only 1536 of the 1568 ciphertext bytes during the Fujisaki-Okamoto re-encryption check in ML-KEM-1024 decapsulation. Ciphertexts that differ from the expected re-encryption solely in bytes 1536-1567 bypass implicit rejection and are accepted as valid, breaking IND-CCA2 security. An attacker able to submit chosen ciphertexts to a decapsulation oracle that uses a static ML-KEM-1024 key, and to observe whether the genuine shared secret or the implicit-rejection secret was produced, can use this as a plaintext-checking oracle to recover the private key. A proof of concept recovered a full ML-KEM-1024 private key with approximately 98% success using roughly 350 chosen ciphertexts. The flaw is a deterministic logic error and does not rely on timing measurements.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | wolfssl | sid | 5.9.2-1.2 | fixed |
| Debian | wolfssl | trixie | 5.7.2-0.1+deb13u2 | vulnerable |
| Debian | wolfssl | bookworm | 5.5.4-2+deb12u2 | vulnerable |
| Debian | wolfssl | bookworm-security | 5.5.4-2+deb12u3 | vulnerable |
| Cpe | wolfssl | Not reported | 5.9.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | wolfssl | source | sid | 5.9.2-1 | not yet assigned | Not reported | Not reported |
| Debian | wolfssl | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | wolfssl | source | bookworm | (unfixed) | end-of-life | Not reported | Not reported |
| Cpe | wolfssl | cpe | Not reported | 5.9.2 | Not reported | Not reported | Not reported |
Notes
[trixie] wolfssl: Minor issue; can be fixed in point release
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libwolfssl35]Affected
Source package: [wolfssl]
Details (4)
5.5.4-2+deb12u2· amd64 · bookwormAffected
nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12
5.5.4-2+deb12u2· arm64 · bookwormAffected
nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12
5.5.4-2+deb12u3· amd64 · bookworm-securityAffected
nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12
5.5.4-2+deb12u3· arm64 · bookworm-securityAffected
nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12
- [libwolfssl-dev]Affected
Source package: [wolfssl]
Details (4)
5.5.4-2+deb12u2· amd64 · bookwormAffected
nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12
5.5.4-2+deb12u2· arm64 · bookwormAffected
nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12
5.5.4-2+deb12u3· amd64 · bookworm-securityAffected
nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12
5.5.4-2+deb12u3· arm64 · bookworm-securityAffected
nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12
[Debian 13 (Trixie)]
- [libwolfssl42t64]Affected
Source package: [wolfssl]
Details (2)
5.7.2-0.1+deb13u1· amd64 · trixieAffected
nvd · wolfssl · debian · 13
5.7.2-0.1+deb13u1· arm64 · trixieAffected
nvd · wolfssl · debian · 13
- [libwolfssl-dev]Affected
Source package: [wolfssl]
Details (2)
5.7.2-0.1+deb13u1· amd64 · trixieAffected
nvd · wolfssl · debian · 13
5.7.2-0.1+deb13u1· arm64 · trixieAffected
nvd · wolfssl · debian · 13
Observed: