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Medium severity · published Jun 22, 2026
CVE-2026-12549
Libsoup: incomplete fix for cve-2026-2443: range suffix overflow in libsoup soupserver
4.8
CVSS
0.4%
EPSS
No
On KEV
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
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
EL
Enterprise Linux · Redhat
6.0; 7.0; 8.0; 9.0; 10.0 · source: NVD
LI
Libsoup · Gnome
All versions, or not specified · source: NVD
Affected product
RH
Red Hat Enterprise Linux 10
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12549
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-12549
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-12549
Vendor Advisory
https://access.redhat.com/security/cve/cve-2026-0716
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2489999
Exploit
https://gitlab.gnome.org/GNOME/libsoup/-/work_items/516
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