CVE-2026-87733: CWE-295 Improper Certificate Validation in OCaml mirage-crypto-ec
CVE-2026-87733 is a vulnerability in the mirage-crypto-ec library for OCaml before version 2.2.0. The issue involves improper certificate validation where the ECDSA functions for P256, P384, and P521 curves accept the encoding of the point at infinity (0x00) as a valid public key. This flaw allows an attacker to forge signatures without possessing the private key. The vulnerability has a medium severity with a CVSS score of 6.2 and does not impact confidentiality or availability but compromises integrity. No official patch or remediation guidance is currently available, and no known exploits are reported in the wild.
AI Analysis
Technical Summary
The mirage-crypto-ec library for OCaml versions prior to 2.2.0 contains an improper certificate validation vulnerability (CWE-295). Specifically, the ECDSA functions {P256,P384,P521}.Dsa.pub_of_octets incorrectly accept 0x00, representing the point at infinity, as a valid public key. This acceptance enables attackers to forge digital signatures without the corresponding private key, undermining signature integrity. The vulnerability is documented as CVE-2026-87733 with a CVSS 3.1 base score of 6.2 (AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). There is no vendor advisory or patch information available at this time.
Potential Impact
The vulnerability allows attackers to forge ECDSA signatures without access to the private key by exploiting acceptance of the point at infinity as a public key. This compromises the integrity of cryptographic operations relying on mirage-crypto-ec's ECDSA implementation. Confidentiality and availability are not affected. No known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should avoid using vulnerable versions of mirage-crypto-ec or implement additional validation to reject the point at infinity as a public key.
CVE-2026-87733: CWE-295 Improper Certificate Validation in OCaml mirage-crypto-ec
Description
CVE-2026-87733 is a vulnerability in the mirage-crypto-ec library for OCaml before version 2.2.0. The issue involves improper certificate validation where the ECDSA functions for P256, P384, and P521 curves accept the encoding of the point at infinity (0x00) as a valid public key. This flaw allows an attacker to forge signatures without possessing the private key. The vulnerability has a medium severity with a CVSS score of 6.2 and does not impact confidentiality or availability but compromises integrity. No official patch or remediation guidance is currently available, and no known exploits are reported in the wild.
CVSS v3.1
Score 6.2medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The mirage-crypto-ec library for OCaml versions prior to 2.2.0 contains an improper certificate validation vulnerability (CWE-295). Specifically, the ECDSA functions {P256,P384,P521}.Dsa.pub_of_octets incorrectly accept 0x00, representing the point at infinity, as a valid public key. This acceptance enables attackers to forge digital signatures without the corresponding private key, undermining signature integrity. The vulnerability is documented as CVE-2026-87733 with a CVSS 3.1 base score of 6.2 (AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). There is no vendor advisory or patch information available at this time.
Potential Impact
The vulnerability allows attackers to forge ECDSA signatures without access to the private key by exploiting acceptance of the point at infinity as a public key. This compromises the integrity of cryptographic operations relying on mirage-crypto-ec's ECDSA implementation. Confidentiality and availability are not affected. No known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should avoid using vulnerable versions of mirage-crypto-ec or implement additional validation to reject the point at infinity as a public key.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-09-09T04:08:54.293Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6aa0e2c5acd9273b49baa908
Added to database: 09/09/2026, 04:38:29 UTC
Last enriched: 09/09/2026, 04:52:47 UTC
Last updated: 09/09/2026, 05:09:36 UTC
Views: 3
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