How severe is CVE-2025-11680?

CVE-2025-11680 has a CVSS 4.0 base score of 5.9, rated medium severity.

Is CVE-2025-11680 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-11680?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-11680 have an EU (EUVD) identifier?

Yes. CVE-2025-11680 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35055.

When was CVE-2025-11680 published?

CVE-2025-11680 was published on 2025-10-20 and last updated on 2026-06-17.

CVE-2025-11680

CVE-2025-11680 is a medium-severity vulnerability with a CVSS 4.0 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-787.

Key facts

Severity: Medium (CVSS 4.0 base score 5.9)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-35055
Weakness: CWE-787
Published: 2025-10-20
Last modified: 2026-06-17

Description

Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big width value that causes an integer overflow which value is used for determining the size of a heap allocation.

Frequently asked questions

What is CVE-2025-11680?: Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big width value that causes an integer overflow which value is used for determining the size of a heap allocation.
How severe is CVE-2025-11680?: CVE-2025-11680 has a CVSS 4.0 base score of 5.9, rated medium severity.
Is CVE-2025-11680 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-11680?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-11680 have an EU (EUVD) identifier?: Yes. CVE-2025-11680 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35055.
When was CVE-2025-11680 published?: CVE-2025-11680 was published on 2025-10-20 and last updated on 2026-06-17.

References

Other CWE-787 (Out-of-bounds Write) vulnerabilities

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CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…

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