RHSA-2026:83384
Vulnerability from csaf_redhat - Published: 2026-10-15 03:10 - Updated: 2026-10-15 18:55Summary
Red Hat Security Advisory: libsoup security update
Severity
Important
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 Important. 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):
* libsoup: libsoup: Heap buffer overflow from WebSocket Pong signal type confusion (CVE-2026-102556)
* libsoup: libsoup: Heap buffer overflow during WebSocket message reassembly (CVE-2026-102557)
* libsoup: libsoup: Heap buffer overflow during WebSocket receive-buffer growth (CVE-2026-102558)
* libsoup: libsoup: Heap buffer overflow during WebSocket client-frame masking (CVE-2026-102559)
* libsoup: libsoup: Heap buffer overflow during outgoing permessage-deflate buffer growth (CVE-2026-102560)
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.
A flaw was found in libsoup. When handling an incoming WebSocket Pong frame, SoupWebsocketConnection emitted the ::pong signal with a GByteArray pointer even though the signal is declared to pass a GBytes. Applications connecting a handler that follows the documented GBytes API can trigger heap corruption or a crash upon receiving a crafted Pong.
8.6 (High)
Affected products
Fixed
21 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.8.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.8.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.8.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-0:2.72.0-16.el9_8.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debuginfo-0:2.72.0-16.el9_8.8.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debuginfo-0:2.72.0-16.el9_8.8.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debuginfo-0:2.72.0-16.el9_8.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debuginfo-0:2.72.0-16.el9_8.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debuginfo-0:2.72.0-16.el9_8.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debugsource-0:2.72.0-16.el9_8.8.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debugsource-0:2.72.0-16.el9_8.8.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debugsource-0:2.72.0-16.el9_8.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debugsource-0:2.72.0-16.el9_8.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-debugsource-0:2.72.0-16.el9_8.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-devel-0:2.72.0-16.el9_8.8.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-devel-0:2.72.0-16.el9_8.8.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-devel-0:2.72.0-16.el9_8.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-devel-0:2.72.0-16.el9_8.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:libsoup-devel-0:2.72.0-16.el9_8.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in libsoup. When reassembling fragmented WebSocket messages into a GByteArray, libsoup did not adequately cap total message size against the limits of the underlying buffer type. A remote peer could send fragments that caused size truncation while the implementation still used the full length, leading to heap corruption or a crash.
8.6 (High)
Affected products
Fixed
21 products, the same list as for
CVE-2026-102556
Threats
Impact
Important
A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.
8.6 (High)
Affected products
Fixed
21 products, the same list as for
CVE-2026-102556
Threats
Impact
Important
A flaw was found in libsoup. When constructing a masked WebSocket client frame for a very large outgoing payload, size values passed to GByteArray allocation APIs could be truncated while the masking routine still used the full length, causing a heap buffer overflow.
8.6 (High)
Affected products
Fixed
21 products, the same list as for
CVE-2026-102556
Threats
Impact
Important
A flaw was found in libsoup. When the permessage-deflate WebSocket extension compresses a very large outgoing message, truncated size calculations used for GByteArray growth could wrap, causing zlib to write past the allocated buffer and resulting in a heap buffer overflow.
8.6 (High)
Affected products
Fixed
21 products, the same list as for
CVE-2026-102556
Threats
Impact
Important
References
28 references
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"text": "2543296"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in libsoup. When the permessage-deflate WebSocket extension compresses a very large outgoing message, truncated size calculations used for GByteArray growth could wrap, causing zlib to write past the allocated buffer and resulting in a heap buffer overflow.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libsoup: libsoup: Heap buffer overflow during outgoing permessage-deflate buffer growth",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue is rated Important. Exploitation requires the permessage-deflate extension to be negotiated and a very large outgoing message to be compressed. Applications that enable WebSocket deflate with untrusted or unbounded message sizes are affected. Impact is heap corruption or denial of service.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-102560"
},
{
"category": "external",
"summary": "RHBZ#2543296",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543296"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-102560",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-102560"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-102560",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102560"
}
],
"release_date": "2026-09-03T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-15T03:10:36+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:83384"
},
{
"category": "workaround",
"details": "To mitigate this disable the permessage-deflate WebSocket extension if it is not required, and cap outgoing message sizes.",
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{
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "libsoup: libsoup: Heap buffer overflow during outgoing permessage-deflate buffer growth"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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- 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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.
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.
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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.