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Description

A heap buffer over-read vulnerability was discovered in libsoup's (versions: libsoup 3.0 to 3.7.0) HTTP/2 connection tracking framework. When the library processes an HTTP/2 GOAWAY frame, it improperly handles the "Additional Debug Data" payload by assuming the data stream is a safely NUL-terminated C-string. Because the parser lacks strict length-boundary verification before reading this data, a remote, unauthenticated attacker can intentionally send a malformed GOAWAY frame missing the appropriate null delimiter. This causes the library to read past the end of the allocated buffer, triggering an application crash that results in a denial of service (DoS), or potentially exposing fragments of memory contents.

PUBLISHED Reserved 2026-07-14 | Published 2026-07-14 | Updated 2026-07-14 | Assigner redhat




MEDIUM: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

Out-of-bounds Read

Product status

Default status
affected

Timeline

2026-07-14:Reported to Red Hat.
2026-07-14:Made public.

Credits

Red Hat would like to thank cavid for reporting this issue.

References

gitlab.gnome.org/GNOME/libsoup/-/work_items/540 exploit

access.redhat.com/security/cve/CVE-2026-15712 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2499939 (RHBZ#2499939) issue-tracking

gitlab.gnome.org/GNOME/libsoup/-/work_items/540

cve.org (CVE-2026-15712)

nvd.nist.gov (CVE-2026-15712)

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