# CVE-2026-12549

## Summary

- **CVE ID:** CVE-2026-12549
- **Severity:** MEDIUM
- **CVSS Score:** 4.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L)
- **CWE:** CWE-805
- **Published:** Jun 22, 2026
- **Last Modified:** Jun 23, 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.

## Affected Products

No affected products listed.

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.41%
- **EPSS Percentile:** 34.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._