CVE-2021-34813

Matrix libolm before 3.2.3 allows a malicious Matrix homeserver to cra ...

Published 16 Jun 2021Modified 17 Jun 2026CWE 787

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Ubuntu (medium).

Description

Matrix libolm before 3.2.3 allows a malicious Matrix homeserver to crash a client (while it is attempting to retrieve an Olm encrypted room key backup from the homeserver) because olm_pk_decrypt has a stack-based buffer overflow. Remote code execution might be possible for some nonstandard build configurations.

Affected packages and fixed versions

Source	Package	Fixed in
debian 10	olm	no fix listed
debian 11	olm	no fix listed
debian 12	olm	3.2.3~dfsg-3
debian 13	olm	3.2.3~dfsg-3
debian 14	olm	3.2.3~dfsg-3
echo	olm	3.2.3~dfsg-3
ubuntu 20.04-ESM	olm	3.1.3+dfsg-2ubuntu0.1~esm1

References

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