CVE-2026-12548: 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

mediumCVSS 4.2CVE-2026-12548

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 4.2
Published: 2026-07-21
Last updated: 2026-07-23
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-12548

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-125480.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-12548	coverage & exploitation status	NVD · CVE.org

Recent advisories for A heap out-of-bounds

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-67291: FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains a heap out-of-bounds read in upda…nvd · 2026-08-01
highCVE-2026-67290: FreeRDP before 3.29.0 contains a heap out-of-bounds read vulnerability in the TSMF FFmpeg deco…nvd · 2026-08-01
lowCVE-2026-66401: FreeRDP before 3.29.0 contains an out-of-bounds heap read vulnerability in the UVC H.264 exten…nvd · 2026-08-01
mediumGHSA-ff84-5f28-78qj: re2: Out-of-bounds heap read in `exec`/`test`/`match` via attacker-influenced `lastIndex`…ghsa · 2026-07-31
highCVE-2026-63559: An integer overflow in the UA_Variant arrayDimensions product computation in open62541 may all…nvd · 2026-07-30
unknownCVE-2026-17544: Attacker-provided inputs to bccomp() could lead to an out-of-bounds write with stack and heap …nvd · 2026-07-30

CVE-2026-12548: 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

Details

Exploitation outlook

Referenced CVEs

Recent advisories for A heap out-of-bounds

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