CVE-2026-76956
CVE-2026-76956 is a medium-severity vulnerability in Libexpat Project Libexpat with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-394.
Key facts
- Severity: Medium (CVSS 3.x base score 5.9)
- EPSS exploit prediction: 0% (19th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-394
- Affected product: Libexpat Project Libexpat
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2026-76956?
- 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.
- How severe is CVE-2026-76956?
- CVE-2026-76956 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-76956 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-76956?
- CVE-2026-76956 affects Libexpat Project Libexpat. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-76956?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2026-76956 published?
- CVE-2026-76956 was published on 2026-08-20 and last updated on 2026-09-08.
References
Affected products (1)
- cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
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