Bundesamt für Sicherheit in der Informationstechnik Debian · expat: Schwachstelle ermöglicht Manipulation von Daten
Affects Bundesamt für Sicherheit in der Informationstechnik DebianSource GCVE Database
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
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 4.0 | 8.7 |
|---|---|---|
| CNA (VulnCheck) | CVSS 3.1 | 7.5 |
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 19 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| libexpatlibexpat | Affected
| Fixed in
|
GitHublibexpatpkg:github/libexpatOther threats | Affected
| Fixed in
|
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
- wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3482.json (opens in a new tab)
- wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-3482 (opens in a new tab)
- github.com/libexpat/libexpat/pull/1282 (opens in a new tab)
- github.com/advisories/GHSA-RFP9-FFQC-H4X8 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:71655 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:72448 (opens in a new tab)
- errata.build.resf.org/RLSA-2026:72448 (opens in a new tab)
- linux.oracle.com/errata/ELSA-2026-72663.html (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:72663 (opens in a new tab)
- linux.oracle.com/errata/ELSA-2026-72448.html (opens in a new tab)
- errata.build.resf.org/RLSA-2026:72663 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2026/09/msg00041.html (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:74001 (opens in a new tab)
- linux.oracle.com/errata/ELSA-2026-74001.html (opens in a new tab)
- errata.build.resf.org/RLSA-2026:74001 (opens in a new tab)
- openbsd.org/errata79.html (opens in a new tab)
- openbsd.org/errata78.html (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:79357 (opens in a new tab)
- lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/UNHPWB2R6VB7YDMBMM26OLWY4B3AVOUT/ (opens in a new tab)
- lists.suse.com/pipermail/sle-security-updates/2026-October/029763.html (opens in a new tab)