CVE-2026-12549
Libsoup: incomplete fix for cve-2026-2443: range suffix overflow in libsoup soupserver
4.8CVSSMEDIUM
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.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:HAttack ComplexityHigh
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:LConfidentialityLow
I:NIntegrityNone
A:LAvailabilityLow
Weaknesses
Affected Products
Exploitability
Workaround Available
References
https://access.redhat.com/security/cve/CVE-2026-12549
access.redhat.com
https://access.redhat.com/security/cve/cve-2026-0716
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2489999
bugzilla.redhat.com
and 1 more references View all →
Timeline
Published
Jun 22, 2026
Last Updated
Jun 22, 2026
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