Description
An issue was discovered in Matrix libolm through 3.2.16. There is Ed25519 signature malleability due to lack of validation criteria (does not ensure that S < n). This refers to the libolm implementation of Olm. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | olm | No fix yet | — |
| Debian 13 | olm | No fix yet | — |
| Debian 12 | olm | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | olm | No fix yet | — |
| Ubuntu 26.04 LTS | olm | No fix yet | — |
| Ubuntu 25.10 | olm | No fix yet | — |
| Ubuntu 24.04 LTS | olm | No fix yet | — |
| Ubuntu 22.04 LTS | olm | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | olm | No fix yet | — |
| Ubuntu Pro 20.04 LTS | olm | No fix yet | — |