CVE-2026-12549

4.8 mediumEPSS 0.4%

Medium (4.8). EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

4.8 medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 29% of CVEs (scores of 2026-10-31)
CWE: CWE-805
Published: 2026-06-22
Modified: 2026-07-08
Record from: the NVD, synced 2026-10-19

Affected

gnome:libsoup
redhat:enterprise_linux

References

https://access.redhat.com/security/cve/CVE-2026-12549
https://access.redhat.com/security/cve/cve-2026-0716
https://bugzilla.redhat.com/show_bug.cgi?id=2489999
https://gitlab.gnome.org/GNOME/libsoup/-/work_items/516

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