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libsoup CVE-2026-15712

| EUVDEUVD-2026-44341 MEDIUM
Out-of-bounds Read (CWE-125)
2026-07-14 redhat GHSA-9fmg-hf32-22c3
Buffer Overflow Denial Of Service Information Disclosure Red Hat Red Hat Enterprise Linux 10 Suse Red Hat
5.9
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

AV:N and PR:N per unauthenticated HTTP/2 delivery; AC:H per SSVC non-automatable; C:L added because description explicitly cites potential memory fragment exposure despite official C:N.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
5.9 LOW
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 22:06 vuln.today
CVE Published
Jul 14, 2026 - 18:11 cve.org
MEDIUM 5.9

DescriptionCVE.org

A heap buffer over-read vulnerability was discovered in libsoup's 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.

AnalysisAI

Heap buffer over-read in libsoup's HTTP/2 GOAWAY frame parser allows remote unauthenticated attackers to crash applications or leak heap memory fragments by sending a malformed frame with a non-NUL-terminated Additional Debug Data payload. Affected deployments include applications built on libsoup running on Red Hat Enterprise Linux 10 that accept or initiate HTTP/2 connections. A proof-of-concept exists per SSVC data, though exploitation is rated non-automatable and this vulnerability is not listed in the CISA KEV catalog at time of analysis.

Technical ContextAI

libsoup is the GNOME project's HTTP client/server library (libsoup-3.0/libsoup-2.4), used widely in GNOME desktop applications and increasingly in headless Linux service contexts for HTTP networking. The vulnerability manifests in the HTTP/2 connection-layer code that processes GOAWAY frames - the HTTP/2 control frame used to initiate graceful connection shutdown. RFC 7540 defines GOAWAY's 'Additional Debug Data' field as an opaque byte sequence with an explicit length field, but the libsoup implementation incorrectly treats this field as a C-string, calling string-handling routines that assume a NUL terminator without first validating the payload length against the frame boundary. CWE-125 (Out-of-Bounds Read) is the root cause class: memory adjacent to the allocated buffer can be read, which in heap allocations may expose sensitive in-process data. The CPE cpe:2.3:a:red_hat:red_hat_enterprise_linux_10:* identifies Red Hat Enterprise Linux 10 as the primary affected platform context, though the flaw is in the upstream libsoup library itself as tracked by GNOME at https://gitlab.gnome.org/GNOME/libsoup/-/work_items/540.

RemediationAI

No specific patched libsoup version number is confirmed in the available data at time of analysis. Monitor the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-15712 and apply RHEL 10 security errata for libsoup as soon as they are released. Track the upstream GNOME fix at https://gitlab.gnome.org/GNOME/libsoup/-/work_items/540 to determine when a patched release lands. As a compensating control until a patch is available, consider restricting HTTP/2 access to libsoup-based services at the network perimeter (e.g., enforcing HTTP/1.1 only via proxy or load-balancer configuration), accepting the trade-off of reduced connection multiplexing efficiency. If applications can be configured to disable HTTP/2 negotiation directly, this eliminates the vulnerable code path entirely but may impact performance-sensitive workloads. The bugzilla tracking entry at https://bugzilla.redhat.com/show_bug.cgi?id=2499939 provides additional Red Hat patch progress information.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Micro 5.3 Affected

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CVE-2026-15712 vulnerability details – vuln.today
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