CVE-2026-66337
mediumA flaw was found in libsoup.
Vendor / product: Gnome — libsoup
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 crafted multipart response, potentially causing the client application to crash or disclose sensitive heap memory.
CVSS
6.5
6.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L Severity source: NVD CVSS v3.1 (secalert@redhat.com)
Timeline (UTC)
Published: 2026-07-24 23:16
Modified: 2026-11-05 23:16
NVD status: Analyzed
Last synced 7 hours ago
Verified against the source API 2026-11-05 23:24 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
gnome / libsoup all versions
redhat / enterprise_linux 6.0, 7.0, 8.0, 9.0, 10.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-66337
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2506949
References
- https://access.redhat.com/security/cve/CVE-2026-66337 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2506949 secalert@redhat.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-05 23:24 UTC · record ↗