CVE-2026-12549
Libsoup: incomplete fix for cve-2026-2443: range suffix overflow in libsoup soupserver
- State
- Published
- Severity
- 4.8 Medium
- Published
- Jun 22, 2026
- Updated
- Jun 23, 2026
- Reserved
- Jun 17, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.8 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L | redhat |
Weaknesses
- CWE-805 Buffer Access with Incorrect Length Value
Affected Products
| Product | Versions |
|---|---|
Red Hat Enterprise Linux 10Red Hat | |
Red Hat Enterprise Linux 6Red Hat | |
Red Hat Enterprise Linux 7Red Hat | |
Red Hat Enterprise Linux 8Red Hat | |
Red Hat Enterprise Linux 9Red Hat |
References
- https://access.redhat.com/security/cve/CVE-2026-12549vdb-entry
- cve-2026-0716technical-description
- RHBZ#2489999issue-tracking
- https://gitlab.gnome.org/GNOME/libsoup/-/work_items/516
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