Evidence used
- No CISA KEV confirmation is currently recorded.
- The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
- EPSS is 0.22% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-102556High confidence
Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion
Red Hat · Red Hat Enterprise Linux 10
8.6HighCVSS 3.1
Within 7 days
Fix not verifiedHigh technical severity; prioritise exposed affected systems while verifying vendor guidance.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityHigh→Operational priority:High, unchanged from published severity.unchanged
Compensating controls
- Restrict the affected network interface to trusted sources where business-safe.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Red Hat Red Hat Enterprise Linux 10 and falls inside the recorded affected range.
- Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Distribution package intelligence
8 package statesRelease-specific package status
Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Debian trixietrixie · source | libsoup2.4 | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian trixietrixie · source | libsoup3 | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian bookwormbookworm · source | libsoup2.4 | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian bookwormbookworm · source | libsoup3 | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian forkyforky · source | libsoup3 | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian sidsid · source | libsoup3 | Vendor fix publishedDebian records a fixed source-package version for this release. | 3.8.0-1 | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | libsoup2.4 | Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing. | Not published in this feed | Canonical Ubuntu Security ↗Source updated 7 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | libsoup3 | Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing. | Not published in this feed | Canonical Ubuntu Security ↗Source updated 7 Oct 2026 |
Direct vendor intelligence
2 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2026-102556 · CSAF 2.0 · revision 2 · interimSUSE Product Security TeamCVE-2026-102556
The vendor explicitly identifies these products as affected by this CVE.
- libsoup as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup-2_4-1 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup-3_0-0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup-lang as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup2 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup2-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup2-lang as component of SUSE Linux Enterprise Desktop 15 SP7
- typelib-1_0-Soup-2_4 as component of SUSE Linux Enterprise Desktop 15 SP7
- typelib-1_0-Soup-3_0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libsoup-2_4-1 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- Summary
- 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.
- Remediation
- No remediation text is recorded.
CVE-2026-102556 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitylibsoup: libsoup: Heap buffer overflow from WebSocket Pong signal type confusion
The vendor explicitly identifies these products as affected by this CVE.
- libsoup3 as a component of Red Hat Enterprise Linux 10
- libsoup3-devel as a component of Red Hat Enterprise Linux 10
- libsoup3-doc as a component of Red Hat Enterprise Linux 10
- libsoup3.src as a component of Red Hat Enterprise Linux 10
- libsoup as a component of Red Hat Enterprise Linux 6
- libsoup-devel as a component of Red Hat Enterprise Linux 6
- libsoup.src as a component of Red Hat Enterprise Linux 6
- libsoup as a component of Red Hat Enterprise Linux 7
- libsoup-devel as a component of Red Hat Enterprise Linux 7
- libsoup.src as a component of Red Hat Enterprise Linux 7
- libsoup as a component of Red Hat Enterprise Linux 8
- libsoup-devel as a component of Red Hat Enterprise Linux 8
- Summary
- 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.
- Remediation
- To mitigate avoid connecting custom handlers to SoupWebsocketConnection::pong, or avoid WebSocket use with untrusted peers.
High technical severity; prioritise exposed affected systems while verifying vendor guidance.
Fix not verified01
What, why and how
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.
What
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.
Why
The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.
What
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.
Why
The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- a network path → Access of Resource Using Incompatible Type ('Type Confusion') → disrupt the affected service
- Attack surface
- Network
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-843 ↗
CWE-843: Access of Resource Using Incompatible Type ('Type Confusion'). The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:HCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.AHighAvailability impact: A successful attack can cause a major loss.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Fix not verified
- Affected
- libsoup as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup-2_4-1 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup-3_0-0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup-lang as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup2 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup2-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup2-lang as component of SUSE Linux Enterprise Desktop 15 SP7
- typelib-1_0-Soup-2_4 as component of SUSE Linux Enterprise Desktop 15 SP7
- typelib-1_0-Soup-3_0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsoup as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libsoup-2_4-1 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libsoup-2_4-1-32bit as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libsoup-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libsoup-lang as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- typelib-1_0-Soup-2_4 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libsoup as component of SUSE Linux Enterprise High Performance Computing 15 SP1
- libsoup-2_4-1 as component of SUSE Linux Enterprise High Performance Computing 15 SP1
- libsoup-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP1
- libsoup-lang as component of SUSE Linux Enterprise High Performance Computing 15 SP1
- typelib-1_0-Soup-2_4 as component of SUSE Linux Enterprise High Performance Computing 15 SP1
- libsoup as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- libsoup-2_4-1 as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- libsoup-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- libsoup-lang as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- typelib-1_0-Soup-2_4 as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- libsoup as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- libsoup-2_4-1 as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- libsoup-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- libsoup-lang as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- and 264 more
- Fixed
- No fixed version is explicitly recorded in the structured CVE data.
- Action
- No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 29 Sept 2026 · Last source change 29 Sept 2026, 17:24 UTC · CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-09-30
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-89031
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- ENISA EUVD mappingEUVD-2026-89031 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-89031"}
- Catalogue recordCVE added to the BlackTree catalogue.CNA ↗
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.