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CVE-2026-93990VulnerabilityPublished Updated

Bundesamt für Sicherheit in der Informationstechnik Debian · expat: Schwachstelle ermöglicht Manipulation von Daten

Affects Bundesamt für Sicherheit in der Informationstechnik DebianSource GCVE Database

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Authoritative record:CVE-2026-93990· High 8.7

Not known to be exploited · CVSS 8.7 High : upgrade Debian libexpat to 2.8.5 soon.

Data as of 12 Nov 2026, 12:32 UTC

CVSS 4.0 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (VulnCheck)CVSS 4.08.7
CNA (VulnCheck)CVSS 3.17.5
Patch
Available – fixed in 2.8.5
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.

What to do

Upgrade libexpat to 2.8.5.

Affected software

ProductAffectedFixed in
libexpatlibexpatAffected
  • <2.8.5
Fixed in
  • 2.8.5
GitHublibexpatpkg:github/libexpatOther threatsAffected
  • <2.8.5
Fixed in
  • 2.8.5

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Fixes are available and should be applied. Red Hat has released updated expat packages addressing CVE-2026-93990 for Red Hat Hardened Images and Red Hat Enterprise Linux 8. Users should update to expat-2.8.4-0.2.hum1 or later for Hardened Images and expat-2.5.0-4.el8_10 or later for RHEL 8. Follow vendor instructions in the Red Hat advisories (RHSA-2026:71655 and RHSA-2026:72448) for applying these updates. No additional mitigation is indicated by the vendor.

Description

CVE-2026-93990 is a vulnerability in the Expat XML parser library written in C that allows XML injection via malformed UTF-16 input. This flaw could enable manipulation of data processed by the parser. Red Hat has issued security advisories addressing this vulnerability with updated expat packages. The vulnerability is rated as having an important security impact by Red Hat. Fixes are available in updated expat packages for Red Hat Hardened Images and Red Hat Enterprise Linux 8. No public exploit code or in-the-wild exploitation is currently known.

References

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