CVE-2026-41080: libexpat · Insufficient Entropy
Affects libexpatSource CVE Database V5
Not known to be exploited · CVSS 2.9 Low : upgrade to 2.8.0 when convenient.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 33% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 2.8.0
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:LExploitation evidence
Disclosed: evidence found.
CVE published 16 Apr 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 30 Oct 2026.
What to do
Upgrade libexpat and libexpat/libexpat to 2.8.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| libexpat projectlibexpat | Affected
| Fixed in
|
GitHublibexpat/libexpatpkg:github/libexpat/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
If you cannot patch yet, avoid processing untrusted XML documents with vulnerable versions of libexpat or implement application-level protections against hash flooding.
Description
libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.
References
- github.com/libexpat/libexpat/pull/1183 (opens in a new tab)
- github.com/libexpat/libexpat/issues/47 (opens in a new tab)
- openwall.com/lists/oss-security/2026/04/26/1 (opens in a new tab)
- blog.hartwork.org/posts/expat-2-8-0-released/ (opens in a new tab)
- openwall.com/lists/oss-security/2026/04/26/1 (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)