{"id":"CVE-2026-102555","title":"Libsoup: libsoup: heap buffer overflow via uninitialized length in data-uri base64 decoding","summary":"A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded NUL byt…","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","cvssSource":"cna","cwe":["CWE-125"],"vendor":"Red Hat","product":"libsoup3","affected":["libsoup3 (all versions)","libsoup","libsoup (all versions)","libsoup (all versions)","libsoup (all versions)"],"published":"2026-09-29","updated":"2026-09-29","sourceUpdated":"2026-09-29T17:15:14.482Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-102555","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-102555"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543224","label":"RHBZ#2543224"}],"tags":["cve.org"],"ingestedAt":"2026-09-29T17:41:02.261Z","slug":"CVE-2026-102555","body":"## Overview\n\nA flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded NUL bytes, the decoded length could remain uninitialized and be used as the size of the returned GBytes. This can lead to an out-of-bounds read or application crash when processing a crafted data URI.\n\n## Affected\n\n- `libsoup3 (all versions)`\n- `libsoup`\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.\n\n### Workarounds\n\nTo mitigate this do not pass untrusted data URIs to soup_uri_decode_data_uri().","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}