{"id":"CVE-2026-66337","title":"Libsoup: libsoup: heap buffer over-read via integer underflow in soup_filter_input_stream_read_until()","summary":"A flaw was found in libsoup. An unsigned integer underflow in the soup_filter_input_stream_read_until() function causes a heap buffer over-read when parsing multipart HTTP responses. A malicious HTTP server can exploit this by sending a …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","cvssSource":"cna","cwe":["CWE-125"],"vendor":"Red Hat","product":"libsoup3","affected":["libsoup3 (all versions)","libsoup (all versions)","libsoup (all versions)","libsoup (all versions)","libsoup (all versions)"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-07-27T16:01:07.951976Z"},"published":"2026-07-24","updated":"2026-11-05","sourceUpdated":"2026-11-05T22:13:09.637Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-66337","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-66337"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2506949","label":"RHBZ#2506949"}],"tags":["cve.org"],"epss":0.00246,"epssPercentile":0.15968,"ingestedAt":"2026-11-05T23:41:31.953Z","slug":"CVE-2026-66337","body":"## Overview\n\nA flaw was found in libsoup. An unsigned integer underflow in the soup_filter_input_stream_read_until() function causes a heap buffer over-read when parsing multipart HTTP responses. A malicious HTTP server can exploit this by sending a crafted multipart response, potentially causing the client application to crash or disclose sensitive heap memory.\n\n## Affected\n\n- `libsoup3 (all versions)`\n- `libsoup (all versions)`\n- `libsoup (all versions)`\n- `libsoup (all versions)`\n- `libsoup (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}