CVE-2026-93990

Severity: Important

Published: 2026-09-19

Expat through 2.8.4 fails to validate low surrogates following high surrogates in UTF-16 input, allowing malformed UTF-16 sequences to be accepted.

Exploit evidence

No public exploit evidence reported by NVD

Last checked: 2026-09-28 17:53 UTC

No exploitation evidence · CISA Coordinator (Assessed 2026-09-21 15:10 UTC)

NVD evidence for CVE-2026-93990 is reported, not independently verified by Package Alert. It does not establish exploit reliability or applicability to a particular package or environment.

References

Fix Status by Distribution

Fix evidence last checked: 2026-10-07 19:05 UTC

Fixed in:

AlmaLinux 10
- ALSA-2026:74001 · Published 2026-10-01
AlmaLinux 8
- ALSA-2026:72448 · Published 2026-09-28
AlmaLinux 9
- ALSA-2026:72663 · Published 2026-10-01
Debian 12 (Bookworm)
- DLA-4807-1 · Published 2026-10-01
Oracle Linux 10
- ELSA-2026-74001 · Published 2026-10-01
Oracle Linux 8
- ELSA-2026-72448 · Published 2026-09-29
Oracle Linux 9
- ELSA-2026-72663 · Published 2026-09-28
Red Hat Enterprise Linux 10
- RHSA-2026:74001 · Published 2026-09-30
Red Hat Enterprise Linux 8
- RHSA-2026:72448 · Published 2026-09-28
Red Hat Enterprise Linux 9
- RHSA-2026:72663 · Published 2026-09-28
Rocky Linux 10
- RLSA-2026:74001 · Published 2026-10-01
Rocky Linux 8
- RLSA-2026:72448 · Published 2026-09-29
Rocky Linux 9
- RLSA-2026:72663 · Published 2026-09-30

No fix evidence found:

Debian 11 (Bullseye)

Debian 13 (Trixie)

Red Hat Enterprise Linux 7 (Extended Lifecycle Support)

SUSE Linux Enterprise Server 12 SP5

SUSE Linux Enterprise Server 15 SP5

SUSE Linux Enterprise Server 15 SP6

SUSE Linux Enterprise Server 15 SP7

SUSE Linux Enterprise Server 16

Ubuntu 22.04 LTS (Jammy Jellyfish)

Ubuntu 24.04 LTS (Noble Numbat)

Ubuntu 25.04 (Plucky Puffin)

Ubuntu 25.10 (Questing Quokka)

Ubuntu 26.04 LTS (Resolute Raccoon)

Interested in being alerted when these distributions have fixes? Set up an alert.