Security readout for executives and security teams
Plain-English summary
A Rust cryptography library for ML-DSA signature verification may accept some invalid signatures. This weakens integrity checks for systems using affected RustCrypto ml-dsa versions. The issue is rated medium because it affects signature validity, not confidentiality or availability, and public sources do not indicate active exploitation.
Executive priority
Treat as a targeted cryptographic integrity fix. Update affected Rust services during the next security maintenance cycle, faster for systems relying on ML-DSA verification for authentication, update signing, or high-value trust decisions.
Technical view
RustCrypto ml-dsa versions 0.0.4 through before 0.1.0-rc.4 use a non-strict check for ML-DSA hint indices, accepting duplicate indices. FIPS 204 and RFC 9881 require strictly increasing indices within each polynomial. The bug is tracked as CWE-347 and fixed in 0.1.0-rc.4.
Likely exposure
Exposure is limited to applications that use the RustCrypto ml-dsa crate for ML-DSA signature verification in affected versions. Risk is higher where verification results authorize software updates, identities, transactions, or other trust decisions.
Exploitation context
The CVSS vector is network-reachable with low complexity and no privileges or user interaction, but impact is limited to integrity. No CISA KEV listing or cited source in the provided bundle reports active exploitation.
Researcher notes
The vulnerability is a regression from changing a strict comparison to a non-strict one. Public references include the advisory, issue, pull request, commits, FIPS 204, RFC 9881, and Wycheproof ML-DSA verification vectors. Evidence supports a medium integrity issue, not broader compromise.
Mitigation direction
- Upgrade RustCrypto ml-dsa to version 0.1.0-rc.4 or later.
- Inventory Rust projects and dependency lockfiles for affected ml-dsa versions.
- Review vendor advisory and repository updates before deploying cryptographic changes.
- Prioritize systems where ML-DSA verification gates trust or authorization decisions.
Validation and detection
- Confirm deployed dependency versions are not >=0.0.4 and <0.1.0-rc.4.
- Review Cargo dependency trees for transitive use of RustCrypto ml-dsa.
- Run standard ML-DSA verification conformance tests, including Wycheproof test vectors where applicable.
- Verify the fixed strict hint-index validation is present after upgrade.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-347: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-24850 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/RustCrypto/signatures/security/advisories/GHSA-5x2r-hc65-25f9CVE reference · x_refsource_CONFIRM
- https://github.com/RustCrypto/signatures/issues/894CVE reference · x_refsource_MISC
- https://github.com/RustCrypto/signatures/pull/895CVE reference · x_refsource_MISC
- https://github.com/RustCrypto/signatures/commit/400961412be2e2ab787942cf30e0a9b66b37a54aCVE reference · x_refsource_MISC
- https://github.com/RustCrypto/signatures/commit/b01c3b73dd08d0094e089aa234f78b6089ec1f38CVE reference · x_refsource_MISC
- https://csrc.nist.gov/pubs/fips/204/finalCVE reference · x_refsource_MISC
- https://datatracker.ietf.org/doc/html/rfc9881CVE reference · x_refsource_MISC
- https://github.com/C2SP/wycheproofCVE reference · x_refsource_MISC
- https://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_44_verify_test.jsonCVE reference · x_refsource_MISC
- https://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_65_verify_test.jsonCVE reference · x_refsource_MISC
- https://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_87_verify_test.jsonCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Verification of Cryptographic Signature
Improper Verification of Cryptographic Signature represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.