CVE-2026-10512 X25519 x86_64 assembly final reduction leaves non-canonical field element
A flaw in wolfSSL's X25519 assembly implementation may produce incorrect shared secrets due to non-canonical field elements, compromising cryptographic integrity.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-10512?
CVE-2026-10512 is a low-severity vulnerability in Wolfssl Wolfssl, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The X25519 x86_64 assembly implementation fails to clear the most significant bit during the final modular reduction, so the computed result may not be fully reduced modulo the field prime 2^255 - 19. This can leave the field element in a non-canonical form, producing an incorrect result from the scalar multiplication and potentially a wrong shared secret. The final carry-propagation chains in the x64 and AVX2 reduction routines could overflow into the top bit, and the high limb was not masked afterward, so the 255-bit field element was left non-canonical.
Weakness: CWE-682
Which versions are affected by CVE-2026-10512?
It affects 1 product.
Products include Wolfssl Wolfssl.
How do I fix CVE-2026-10512?
Apply the vendor's patch.
Is CVE-2026-10512 being exploited?
There is no known exploitation of CVE-2026-10512 in the wild and no public exploit code.
Other vulnerabilities in Wolfssl Wolfssl
Sources
Also known as DEBIAN-CVE-2026-10512, GHSA-gjm7-vch5-hch8, JLSEC-2026-695, UBUNTU-CVE-2026-10512.