CVE-2026-66337CWE-125

CVE-2026-66337

Medium · published July 25, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
15.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00246 · 15.0th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-07-25T03:16Z
Affected products (6)
ProductVersionsFixed in
gnome/libsoupall versions—
redhat/enterprise_linuxall versions—
redhat/enterprise_linuxall versions—
redhat/enterprise_linuxall versions—
redhat/enterprise_linuxall versions—
redhat/enterprise_linuxall versions—
References (2)
https://access.redhat.com/security/cve/CVE-2026-66337 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2506949 · [email protected]
EPSS history
Timeline
  • 24 JUL 23:01Z
    Libsoup: libsoup: heap buffer over-read via integer underflow in soup_filter_input_stream_read_until()
    cvelistv5