CVE-2026-12549 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-12549MEDIUM

Red Hat Red Hat Enterprise Linux 10 — Libsoup: incomplete fix for cve-2026-2443: range suffix overflow in libsoup soupserver

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   N  U  L  N  L    4.8   .0041   34.4     —

AFFECTED
  Product                      Versions     Fixed
  Red Hat Enterprise Linux 10  unspecified  —
  Red Hat Enterprise Linux 6   unspecified  —
  Red Hat Enterprise Linux 7   unspecified  —
  Red Hat Enterprise Linux 8   unspecified  —
  Red Hat Enterprise Linux 9   unspecified  —

TIMELINE
  Jun 17  Reserved by redhat
  Jun 22  EXPLOIT PUBLISHED — CVE-2026-12549 (Red Hat Enterprise Linux 10). Public exploit reference added.
  Jun 22  Published (CNA: redhat)

CWE-805 · CNA: redhat · CVSS v3.1 · 4 references · NVD status: Analyzed

Description

The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulting negative start value is not properly clamped, leading to malformed HTTP 206 responses and log flooding.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 17, 2026	Reserved	Reserved by redhat
June 22, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-12549 (Red Hat Enterprise Linux 10). Public exploit reference added.
June 22, 2026	Published	Published (CNA: redhat)

Affected

Affected products and packages — 5 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Red Hat	Red Hat Enterprise Linux 10	—	—	—
Red Hat	Red Hat Enterprise Linux 6	—	—	—
Red Hat	Red Hat Enterprise Linux 7	—	—	—
Red Hat	Red Hat Enterprise Linux 8	—	—	—
Red Hat	Red Hat Enterprise Linux 9	—	—	—

Weaknesses

CWE-805

References (4)

https://access.redhat.com/security/cve/CVE-2026-12549 [Vendor Advisory, Mitigation]
https://access.redhat.com/security/cve/cve-2026-0716 [Vendor Advisory, Mitigation]
https://bugzilla.redhat.com/show_bug.cgi?id=2489999 [Issue Tracking, Vendor Advisory]
https://gitlab.gnome.org/GNOME/libsoup/-/work_items/516 [Exploit, Issue Tracking, Patch, Vendor Advisory]

Authoritative record: CVE-2026-12549 at cve.org

Vendors: red hat

Weaknesses: CWE-805

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-12549 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 Wednesday, August 19, 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.