CVE-2025-11679— Out-of-bounds Read in libwebsockets PNG parsing
Quick assessment
Affected
warmcat libwebsockets
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Libwebsockets是lws-team开源的一个规范的 libwebsockets 网络库。 Libwebsockets存在缓冲区错误漏洞，该漏洞源于当启用LWS_WITH_UPNG标志并使用HTML显示堆栈时，lws_upng_emit_next_line函数存在越界读取，可能导致读取堆分配缓冲区之外的数据，造成崩溃。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-11679
Vulnerability Information
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Vulnerability Title
Out-of-bounds Read in libwebsockets PNG parsing
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Libwebsockets 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Libwebsockets是lws-team开源的一个规范的 libwebsockets 网络库。 Libwebsockets存在缓冲区错误漏洞，该漏洞源于当启用LWS_WITH_UPNG标志并使用HTML显示堆栈时，lws_upng_emit_next_line函数存在越界读取，可能导致读取堆分配缓冲区之外的数据，造成崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| warmcat | libwebsockets | 4.0 ~ 4.4.2 | - |
|
II. Public POCs for CVE-2025-11679
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · warmcat · 2025-10-20 · 4 CVEs total
| CVE-2025-11677 | Use After Free in libwebsockets WebSocket server | |
| CVE-2025-11678 | Stack-based Buffer Overflow in libwebsockets DNS response parsing | |
| CVE-2025-11680 | Out-of-bounds Write in libwebsockets PNG parsing |
IV. Related Vulnerabilities
Same product: libwebsockets
-
CVE-2026-78161
warmcat libwebsockets LECP CBOR Recording lecp.c report_raw_ -
CVE-2026-10650
warmcat libwebsockets SSH Protocol sshd.c lws_ssh_parse_plai -
CVE-2025-11680
Out-of-bounds Write in libwebsockets PNG parsing -
CVE-2025-11677
Use After Free in libwebsockets WebSocket server -
CVE-2025-1866
Undefined Behavior Due to Out-of-Bounds Pointer Arithmetic i
Same vendor: warmcat
-
CVE-2026-78161
warmcat libwebsockets LECP CBOR Recording lecp.c report_raw_ -
CVE-2026-10650
warmcat libwebsockets SSH Protocol sshd.c lws_ssh_parse_plai -
CVE-2025-11680
Out-of-bounds Write in libwebsockets PNG parsing -
CVE-2025-11678
Stack-based Buffer Overflow in libwebsockets DNS response pa -
CVE-2025-11677
Use After Free in libwebsockets WebSocket server
Same weakness: CWE-125
-
CVE-2026-61555
OpenEXR: Empty multiView viewFromChannelName file crash -
CVE-2026-59985
OpenEXR: Heap out-of-bounds read in OpenEXRCore RLE decoding -
CVE-2026-59983
OpenEXR: Out-of-bounds read in DeepTiledInputFile sample-cou -
CVE-2026-75752
Substance3D - Painter | Out-of-bounds Read (CWE-125) -
CVE-2026-71441
Illustrator | Out-of-bounds Read (CWE-125)
V. Comments for CVE-2025-11679
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