CVE-2026-77014
MEDIUMDescription
A flaw was found in libsoup's SoupServer HTTP Range header processing. The sort_ranges() comparator in soup-message-headers.c truncates a 64-bit subtraction result to 32-bit int, flipping the sign for range offsets differing by more than INT_MAX. This causes silent omission of requested byte ranges from HTTP 206 Partial Content responses on resources larger than approximately 2 GB.
How to fix
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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U
Exploit Intelligence
Low risk: more likely to be exploited than 13% of all known CVEs.
References
Related Vulnerabilities
Other CWE-197 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-42475 | Critical | 9.8 | 99% | KEV + Ransom | Fix |
| CVE-2025-6965 | High | 7.7 | 71% | - | Fix |
| CVE-2024-21310 | High | 7.8 | 12% | - | Fix |
| CVE-2024-43639 | Critical | 9.8 | 8.9% | - | Fix |
| CVE-2024-38125 | High | 7.8 | 5.9% | - | Fix |
| CVE-2024-28944 | High | 8.8 | 2.4% | - | Fix |
Common questions
How do I fix CVE-2026-77014?
Published advisories record a fix for 14 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2026-77014 being actively exploited?
Not that we know of. CVE-2026-77014 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.23% is the estimated probability that it will be exploited in the next 30 days. That is higher than 13% of all scored CVEs.
How severe is CVE-2026-77014?
CVE-2026-77014 has a CVSS v3 base score of 5.3, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-77014 affect?
Published advisories record a fix for gir1.2-soup-2.4 (Ubuntu), gir1.2-soup-3.0 (Ubuntu), libsoup-2.4-1 (Ubuntu), libsoup-3.0-0 (Ubuntu), and 10 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-25.