Quick answers
- Is CVE-2026-77014 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-77014 being exploited in the wild.
- How severe is CVE-2026-77014?
- Medium severity, with a CVSS score of 5.3, published 20 August 2026.
- Which products and versions are affected?
- Gnome Libsoup <unknown>.
- Is there a fix for CVE-2026-77014?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-77014 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-77014?
- Check whether you run Gnome Libsoup at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An integer truncation vulnerability (CWE-197) exists in the sort_ranges() comparator function in soup-message-headers.c. A 64-bit subtraction result is truncated to a 32-bit integer, causing sign flips when range offsets differ by more than INT_MAX. This affects HTTP 206 Partial Content responses for resources larger than ~2 GB. The vulnerability is network-reachable and requires no authentication or user interaction; it only manifests when serving large files. The attacker can cause silent omission of requested byte ranges from server responses. A fix is available in the upstream GNOME libsoup project (merge request #550).
Affected products
- GNOME libsoup <unknown>
Timeline
- 2026-08-20: disclosed