Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-12548

CVE-2026-12548MEDIUM

Red Hat Red Hat Enterprise Linux 10 — Libsoup: heap out-of-bounds read in libsoup due to integer truncation

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   R  U  L  N  L    4.2   .0025   15.4     —

AFFECTED
  Product                      Versions     Fixed
  Red Hat Enterprise Linux 10  unspecified  —

TIMELINE
  Jun 17  Reserved by redhat
  Jul 21  Published (CNA: redhat)
  Aug 24  EXPLOIT PUBLISHED — CVE-2026-12548 (Red Hat Enterprise Linux 10). Public exploit reference added.

CWE-125 · CNA: redhat · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 17, 2026	Reserved	Reserved by redhat
July 21, 2026	Published	Published (CNA: redhat)
August 24, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-12548 (Red Hat Enterprise Linux 10). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Red Hat	Red Hat Enterprise Linux 10	—	—	—

Weaknesses

CWE-125

References (3)

https://access.redhat.com/security/cve/CVE-2026-12548 [Vendor Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=2489996 [Exploit, Issue Tracking, Vendor Advisory]
https://gitlab.gnome.org/GNOME/libsoup/-/work_items/512 [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-12548 at cve.org

Vendors: red hat

Weaknesses: CWE-125

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-12548 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.