CVE-2026-66337

Summary

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.

Affected Software

Weaknesses

• CWE-125: Out-of-bounds Read

References

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

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