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OSEC-2026-15
The internal Point.of_octets function is missing a length check for compressed
points, and thus is raising an exception when a short buffer is provided. This
affects all NIST curves (P-256, P-384, P-521) and both Dsa.pub_of_octets and
Dh.key_exchange functions.
Fix
The fix is to check the length of the provided buffer.
Timeline
- July 28th 2026: report to security@ocaml.org
- August 7th: release of mirage-crypto-pk 2.3.0 and security advisory
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
- CVE-2026-87736Alias
- EUVD-2026-74622Alias
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