CVE-2025-11679— Out-of-bounds Read in libwebsockets PNG parsing
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
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 weakness: CWE-125
- CVE-2026-8177
XML::LibXML versions through 2.0210 for Perl read out-of-bou - CVE-2026-6104
Global buffer over-read in mb_convert_encoding() with attack - CVE-2026-7258
Out-of-bounds read in urldecode() on NetBSD - CVE-2026-8186
Open5GS NF client.c ogs_sbi_client_send_via_scp_or_sepp out- - CVE-2026-3508
ASUS System Control Interface 缓冲区错误漏洞
V. Comments for CVE-2025-11679
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