Underflow in aes_key_unwrap function

The `aes_key_unwrap` function would panic if passed a ciphertext that was too short. In a debug build, it would panic due to a subtraction underflow. In a release build, it would use the small negative quantity to allocate a vector. Since the allocator expects an unsigned quantity, the negative value would be interpreted as a huge allocation. The allocator would then fail to allocate the memory and panic. An attacker could trigger this panic by sending a victim an encrypted message whose PKESK or SKESK packet has been specially modified. When the victim decrypts the message, the program would crash.

Source published

7 Nov 2025 12:00:00 UTC

Source modified

17 Dec 2025 06:16:23 UTC

Observed here

24 Oct 2026 13:19:54 UTC

Source terms

OSV · upstream source license applies

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L