CVE-2026-77014: Libsoup: libsoup: integer truncation in sort_ranges() comparator causes silent omission of http range responses

mediumCVSS 5.3CVE-2026-77014

CSIRTS triage

vendor: GNOME product: Libsoup Information disclosure

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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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.3
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77014

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-770140.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-77014	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

mediumCVE-2026-77014: A flaw was found in libsoup's SoupServer HTTP Range header processing. The sort_ranges() compa…nvd

Recent advisories for Libsoup

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-77680: An algorithmic complexity flaw exists in libsoup's HTTP Range header processing that persists …nvd · 2026-08-25
mediumCVE-2026-77014: A flaw was found in libsoup's SoupServer HTTP Range header processing. The sort_ranges() compa…nvd · 2026-08-20
lowCVE-2026-3633: Libsoup: libsoup: header and http request injection via crlf injectionmsrc · 2026-08-06
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mediumCVE-2026-66339: Libsoup: libsoup: proxy credentials leak to destination server via proxy-authorization header …msrc · 2026-08-06
lowCVE-2026-3634: Libsoup: libsoup: http header injection and response splitting via crlf injection in content-ty…msrc · 2026-08-06