CVE-2026-66339Medium· 6.5▾ SunlitA flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup incorrectly attaches the Proxy-Authorization header to subsequent HTTPS requests sent through that tunnel to the destination server. This a…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 35.8 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup incorrectly attaches the Proxy-Authorization header to subsequent HTTPS requests sent through that tunnel to the destination server. This allows the destination server to capture proxy credentials, leading to information disclosure.
libsoup3 (all versions)libsoup (all versions)libsoup (all versions)libsoup (all versions)libsoup (all versions)Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-1539Medium· 5.8Libsoup: libsoup: credential leakage via http redirects
CVE-2026-77680Medium· 5.3Libsoup3: libsoup: quadratic cpu denial of service in http range coalescing after cve-2025-32907 fix
CVE-2026-77014Medium· 5.3Libsoup: libsoup: integer truncation in sort_ranges() comparator causes silent omission of http range responses
CVE-2026-66337Medium· 6.5Libsoup: libsoup: heap buffer over-read via integer underflow in soup_filter_input_stream_read_until()
CVE-2026-5119Medium· 5.9Libsoup: libsoup: information disclosure via cleartext transmission of cookies during https tunnel establishment
CVE-2026-4271Medium· 5.3Libsoup: libsoup: denial of service via use-after-free in http/2 server