Vulnerability-Lookup

RHSA-2026:68234

Vulnerability from csaf_redhat - Published: 2026-09-16 17:18 - Updated: 2026-09-16 23:35

Summary

Red Hat Security Advisory: libsoup security update

Severity

Moderate

Notes

Topic: An update for libsoup is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: The libsoup packages provide an HTTP client and server library for GNOME. Security Fix(es): * SoupWebsocketExtensionDeflate: libsoup: libsoup: WebSocket permessage-deflate Unbounded Decompression Remote Denial of Service (CVE-2026-15709) * libsoup: SoupWebsocketConnection: libsoup: WebSocket remote denial of service via oversized control frame protocol violation (CVE-2026-15711) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-15709

A flaw was found in libsoup's WebSocket implementation when using the permessage-deflate extension. The extension's decompression loop (inflate()) processes data in chunks without enforcing an upper boundary limit on the output buffer size. While libsoup limits the incoming compressed frame size via max_incoming_payload_size, it fails to track or limit memory allocation during decompression. A separate check for decompressed size (max_total_message_size) exists but executes only after inflation is complete, and it is entirely disabled by default for client connections. A remote, unauthenticated attacker can exploit this by sending a small, highly compressed payload (a decompression bomb), causing unbounded memory allocation that triggers an Out-of-Memory (OOM) crash and a Denial of Service (DoS).

7.5 (High)


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

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Affected products

Fixed 21 products

Product	Version	Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.3.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.3.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.3.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.3.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.3.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.3.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debuginfo-0:2.72.0-16.el9_8.3.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debuginfo-0:2.72.0-16.el9_8.3.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debuginfo-0:2.72.0-16.el9_8.3.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debuginfo-0:2.72.0-16.el9_8.3.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debuginfo-0:2.72.0-16.el9_8.3.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debugsource-0:2.72.0-16.el9_8.3.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debugsource-0:2.72.0-16.el9_8.3.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debugsource-0:2.72.0-16.el9_8.3.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debugsource-0:2.72.0-16.el9_8.3.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debugsource-0:2.72.0-16.el9_8.3.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-devel-0:2.72.0-16.el9_8.3.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-devel-0:2.72.0-16.el9_8.3.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-devel-0:2.72.0-16.el9_8.3.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-devel-0:2.72.0-16.el9_8.3.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-devel-0:2.72.0-16.el9_8.3.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

CVE-2026-15711

A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets.

7.5 (High)


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

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Fixed 21 products, the same list as for CVE-2026-15709

Threats

Impact Moderate

References

15 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:68234	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2499922	external
https://bugzilla.redhat.com/show_bug.cgi?id=2499924	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-15709	self
https://bugzilla.redhat.com/show_bug.cgi?id=2499922	external
https://www.cve.org/CVERecord?id=CVE-2026-15709	external
https://nvd.nist.gov/vuln/detail/CVE-2026-15709	external
https://gitlab.gnome.org/GNOME/libsoup/-/issues/511	external
https://access.redhat.com/security/cve/CVE-2026-15711	self
https://bugzilla.redhat.com/show_bug.cgi?id=2499924	external
https://www.cve.org/CVERecord?id=CVE-2026-15711	external
https://nvd.nist.gov/vuln/detail/CVE-2026-15711	external
https://gitlab.gnome.org/GNOME/libsoup/-/issues/515	external

Acknowledgments

Tristan Madani

Sebastián Alba Vives (@Sebasteuo / 0xS4bb1)

JSON

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}

CVE-2026-15709 (GCVE-0-2026-15709)

Vulnerability from cvelistv5 – Published: 2026-07-14 19:41 – Updated: 2026-09-16 18:13

Title

Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 12:58 UTC

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

redhat redhat root

References

5 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:68234	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:68235	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-15709	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2499922	issue-trackingx_refsource_REDHAT
https://gitlab.gnome.org/GNOME/libsoup/-/issues/511

Impacted products

5 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:3.6.5-3.el10_2.14 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:2.72.0-16.el9_8.3 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8

Date Public

2026-07-14 09:42

Credits

Red Hat would like to thank Tristan Madani for reporting this issue.

Show details on NVD website

JSON

To clipboard

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                "timestamp": "2026-07-15T12:58:14.451474Z",
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CVE-2026-15711 (GCVE-0-2026-15711)

Vulnerability from cvelistv5 – Published: 2026-07-14 19:45 – Updated: 2026-09-16 18:13

Title

Libsoup: soupwebsocketconnection: libsoup: websocket remote denial of service via oversized control frame protocol violation

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 14:10 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

redhat redhat root

References

6 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:68234	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:68235	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:68266	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-15711	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2499924	issue-trackingx_refsource_REDHAT
https://gitlab.gnome.org/GNOME/libsoup/-/issues/515

Impacted products

5 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:3.6.5-3.el10_2.14 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:2.62.3-15.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::appstream cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:2.72.0-16.el9_8.3 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7

Date Public

2026-07-14 09:52

Credits

Red Hat would like to thank Sebastián Alba Vives (@Sebasteuo / 0xS4bb1) for reporting this issue.

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

RHSA-2026:68234

CVE-2026-15709 (GCVE-0-2026-15709)

CVE-2026-15711 (GCVE-0-2026-15711)

Tags

Sightings

Nomenclature

Related by attack behaviour