Heap Buffer Over-Read Vulnerability in Libsoup Affecting Red Hat
CVE-2026-66337

6.5MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
24 July 2026

What is CVE-2026-66337?

A flaw exists in Libsoup, where an unsigned integer underflow in the soup_filter_input_stream_read_until() function can lead to a heap buffer over-read while processing multipart HTTP responses. This vulnerability could be exploited by a malicious HTTP server that sends specially crafted multipart responses, which may result in client application crashes or exposure of sensitive information residing in heap memory.

References

https://access.redhat.com/security/cve/CVE-2026-66337
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2506949
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Upstream acknowledges cavid as the original reporter.
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