CVE-2026-77014

mediumCVSS 5.3covered by 2 sourcesfirst seen 2026-08-11

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.

CSIRTS triage

What: Integer truncation in the sort_ranges() comparator causes silent omission of HTTP range responses.
Who is affected: Applications using Libsoup that process HTTP range requests.
Urgency: Medium severity (CVSS 5.3); information disclosure through incorrect range handling.
Action: Update Libsoup to a patched version addressing CVE-2026-77014.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all EPSS-scored CVEs.

Advisory coverage (2)

mediumCVE-2026-77014: A flaw was found in libsoup's SoupServer HTTP Range header processing. The sort_ranges() compa…nvd · 2026-08-20
mediumCVE-2026-77014: Libsoup: libsoup: integer truncation in sort_ranges() comparator causes silent omission of htt…msrc · 2026-08-11

External references

NVD record for CVE-2026-77014

CVE.org record

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