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TI-2026-53752 Aliases CVE-2026-76956GHSA-x282-q22w-c9hm

In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code…

Priority LOW 39CWE-394Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00287 21st percentileScored 2026-11-07
Fix Fixed libexpat (libexpat project): 2.8.4Red Hat: 2 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
libexpat projectlibexpat2.8.2 to before 2.8.42.8.4Patch availableCNA
  • libexpat Vendorlibexpat project Affected 2.8.2 to before 2.8.4 Fixed in 2.8.4 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*2.8.2 to before 2.8.4Vulnerablelibexpat project
  • cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* Versions 2.8.2 to before 2.8.4 Vulnerable ·libexpat project

Remediation

  • Fix · CNA libexpat (libexpat project) Fixed in 2.8.4

Red Hat 2 advisories

  • RHSA-2026:65568 Released 2026-09-08 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images expat-2.8.4-0.1.hum1@aarch64, expat-2.8.4-0.1.hum1@src, expat-2.8.4-0.1.hum1@x86_64 +4
  • RHSA-2026:60451 Released 2026-08-27 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images expat-2.8.3-0.1.1.hum1@aarch64, expat-2.8.3-0.1.1.hum1@src, expat-2.8.3-0.1.1.hum1@x86_64 +4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    libexpat 2.8.4

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:60451, RHSA-2026:65568
Not affected: 7 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-76956
  2. 2026-10-03 Alias added: GHSA-x282-q22w-c9hm
  3. 2026-11-06 Affected versions changed · Red Hat

References

Patch 2

  • TI-2022-09008 In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames. CVSS 3.1CRITICAL 9.8
  • TI-2026-79488 Billion laughs detection delay in libexpat enables denial of service CVSS 4.0HIGH 8.7
  • TI-2022-08947 xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert… CVSS 3.1CRITICAL 9.8
  • TI-2021-20962 In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the… CVSS 3.1HIGH 8.8
  • TI-2021-21076 In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize. CVSS 3.1HIGH 8.1
  • TI-2016-00645 Expat allows context-dependent attackers to cause a denial of service (crash) or possibly… CVSS 3.1CRITICAL 9.8
See all 67 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences