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% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

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.

CVE-2026-76956

CVE-2026-76956 is a medium-severity vulnerability 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% (17th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-394
Published: 2026-08-20
Last modified: 2026-08-20

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% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
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.

References

Other CWE-394 vulnerabilities

CVE-2025-12516 — Critical (CVSS 9.8): Lack of Graceful Error Handling - HTTP 5xx ErrorThis issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5 .
CVE-2025-12515 — Critical (CVSS 9.8): Systemic Internal Server Errors - HTTP 500 ResponseThis issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5 .
CVE-2026-25085 — High (CVSS 8.6): A vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, in which an unexpected return value from the…
CVE-2019-0066 — High (CVSS 7.5): An unexpected status return value weakness in the Next-Generation Multicast VPN (NG-mVPN) service of Juniper Networks…
CVE-2025-23013 — High (CVSS 7.3): In Yubico pam-u2f before 1.3.1, local privilege escalation can sometimes occur. This product implements a Pluggable…
CVE-2025-48510 — High (CVSS 7.1): Improper return value within AMD uProf can allow a local attacker to bypass KSLR, potentially resulting in loss of…

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