CVE-2026-12548Medium· 4.2▾ TwilightPoC availableA heap out-of-bounds read flaw was found in libsoup. When parsing multipart HTTP messages, an integer type mismatch between the caller and soup_headers_parse() can cause the length parameter to be incorrectly truncated, leading to a heap…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 23.1 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
A heap out-of-bounds read flaw was found in libsoup. When parsing multipart HTTP messages, an integer type mismatch between the caller and soup_headers_parse() can cause the length parameter to be incorrectly truncated, leading to a heap buffer over-read. A remote attacker could use this flaw to crash an application using libsoup or potentially disclose heap memory contents.
libsoup3 (all versions)Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-15714Medium· 6.5Libsoup: soupmultipartinputstream: libsoup: out-of-bounds read in soup_multipart_input_stream_read_headers via an oversized multipart boundary string
CVE-2026-12478Medium· 4.8The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected
CVE-2026-66337Medium· 6.5Libsoup: libsoup: heap buffer over-read via integer underflow in soup_filter_input_stream_read_until()
CVE-2026-102560High· 8.6A flaw was found in libsoup
CVE-2026-102559High· 8.6A flaw was found in libsoup
CVE-2026-77680Medium· 5.3Libsoup3: libsoup: quadratic cpu denial of service in http range coalescing after cve-2025-32907 fix