CVE catalog
CVE-2025-11679
Out-of-bounds Read in lws_upng_emit_next_line in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to read past a heap allocat
- Severity
- Medium · CVSS 5.9
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.39% · Oct 25, 2026
Out-of-bounds Read in lws_upng_emit_next_line in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to read 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 height dimension.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libwebsockets | sid | 4.3.5-7 | not affected |
| Debian | libwebsockets | forky | 4.3.5-7 | not affected |
| Debian | libwebsockets | trixie | 4.3.5-1+deb13u2 | not affected |
| Debian | libwebsockets | trixie-security | 4.3.5-1+deb13u3 | not affected |
| Debian | libwebsockets | bookworm | 4.1.6-3 | not affected |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libwebsockets | source | sid | Not affected | unimportant | Not reported | Not reported |
| Debian | libwebsockets | source | forky | Not affected | unimportant | Not reported | Not reported |
| Debian | libwebsockets | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | libwebsockets | source | bookworm | Not affected | unimportant | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libwebsockets17]Not affected
Source package: [libwebsockets]
Details (2)
4.1.6-3· amd64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
4.1.6-3· arm64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
- [libwebsockets-dev]Not affected
Source package: [libwebsockets]
Details (2)
4.1.6-3· amd64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
4.1.6-3· arm64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
- [libwebsockets-evlib-ev]Not affected
Source package: [libwebsockets]
Details (2)
4.1.6-3· amd64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
4.1.6-3· arm64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
- [libwebsockets-evlib-glib]Not affected
Source package: [libwebsockets]
Details (2)
4.1.6-3· amd64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
4.1.6-3· arm64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
- [libwebsockets-evlib-uv]Not affected
Source package: [libwebsockets]
Details (2)
4.1.6-3· amd64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
4.1.6-3· arm64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
- [libwebsockets-test-server]Not affected
Source package: [libwebsockets]
Details (2)
4.1.6-3· amd64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
4.1.6-3· arm64 · bookwormNot affected
nvd · libwebsockets · debian · bookworm
- [libwebsockets-test-server-common]Not affected
Source package: [libwebsockets]
Details (2)
4.1.6-3· all · bookwormNot affected
nvd · libwebsockets · debian · bookworm
4.1.6-3· all · bookwormNot affected
nvd · libwebsockets · debian · bookworm
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2025-11679]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2025-11679]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2025-11679]
- [https://security-tracker.debian.org/tracker/CVE-2025-11679]
- [https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-11679.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]