AIKIDO-2026-92609
openmls is vulnerable to Denial of Service (DoS)
53
Medium Risk
This Affects:
openmlsTL;DR
When decoding an extension list, each extension is checked for duplicate types by linearly scanning every previously accepted extension, giving quadratic time in the number of extensions. Because extension lists are decoded from untrusted MLS objects before authentication, supplying a vector with many distinct extension types forces excessive CPU work. A moderately sized input can take seconds to deserialize, enabling a denial of service against applications parsing such objects. The fix replaces the linear scan with an efficient duplicate check.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application deserializes untrusted MLS objects containing extension lists on openmls between 0.6.0 and 0.8.1 without size or rate limits.
Background info
openmls is vulnerable to Denial of Service (DoS) in versions 0.6.0 - 0.8.1.
How to fix this
Upgrade the openmls library to the patch version.
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