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CVE Record

CVE-2026-1761: Libsoup: stack-based buffer overflow in libsoup multipart response parsingmultipart http response

A flaw was found in libsoup. This stack-based buffer overflow vulnerability occurs during the parsing of multipart HTTP responses due to an incorrect length calculation. A remote attacker can exploit this by sending a specially crafted multipart HTTP response, which can lead to memory corruption. This issue may result in application crashes or arbitrary code execution in applications that process untrusted server responses, and it does not require authentication or user interaction.

HighCVSS 8.6Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-1761 is a high-severity libsoup flaw where a malicious HTTP server response can corrupt memory in software that parses multipart responses. The business risk is service crashes or possible code execution in affected Red Hat environments and applications using vulnerable libsoup packages.

Executive priority

Treat as priority patching for affected Red Hat systems because the vulnerability is remotely reachable and can affect integrity and availability. Escalate fastest where systems process untrusted HTTP responses or support business-critical workloads.

Technical view

The issue is a stack-based buffer overflow caused by incorrect length calculation during multipart HTTP response parsing. It is remotely reachable over the network, requires no authentication or user interaction, and is scored CVSS 3.1 8.6. The supplied affected data covers Red Hat libsoup, libsoup3, and spice-client-win packages across RHEL 7 ELS, RHEL 8 variants, and RHEL 10.

Likely exposure

Exposure is most likely where affected Red Hat systems or bundled applications process HTTP responses from untrusted or attacker-controlled servers, especially multipart responses. The source bundle does not establish impact for non-Red Hat distributions.

Exploitation context

The bundle states remote exploitation is possible through a specially crafted multipart HTTP response. It also marks KEV as false, so there is no provided evidence of known active exploitation. No exploit details or proof-of-concept status are included.

Researcher notes

Evidence is strongest for Red Hat-packaged libsoup, libsoup3, and spice-client-win. The bundle identifies CWE-121 and high CVSS but does not provide fixed version details, exploit maturity, or non-Red Hat scope. Avoid assuming broader ecosystem exposure without vendor confirmation.

Mitigation direction

  • Check Red Hat advisories for applicable fixed packages and deployment guidance.
  • Prioritize updates for internet-facing clients or services processing untrusted HTTP responses.
  • Inventory affected libsoup, libsoup3, and spice-client-win packages across RHEL estates.
  • Reduce exposure to untrusted HTTP endpoints where practical until patched.
  • Monitor affected applications for crashes or abnormal memory-corruption symptoms.

Validation and detection

  • Compare installed package names and versions against the affected package list.
  • Confirm systems map to the listed RHEL CPEs and lifecycle channels.
  • Verify applicable RHSA updates are installed after remediation.
  • Review application logs for crashes during multipart HTTP response handling.
  • Track CVE and Red Hat advisory updates for revised affected or fixed status.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-121: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-1761 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.6 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
2ADP providers
25Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L3.94.7redhat
8.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L3.94.7redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8.6High
CVSS 3.1 vector shape for CVE-2026-1761Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. ADP timelineredhat-SADP

    Made public.

  2. Source timelineredhat

    Made public.

  3. ADP timelineredhat-SADP

    Reported to Red Hat.

  4. Source timelineredhat

    Reported to Red Hat.

  5. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  6. CVE publishedCVE Program

    The CVE record was published.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPlibsoup: Stack-Based Buffer Overflow in libsoup Multipart Response Parsingmultipart HTTP response
other:Red Hat severity ratingcvssV3_1
  • 2026-02-02T12:51:56.172Z: Reported to Red Hat.
  • 2026-02-02T00:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat Enterprise Linux 10libsoup3, 0:3.6.5-3.el10_1.9affected
Red HatRed Hat Enterprise Linux 10libsoup3, 0:3.6.5-3.el10_1.10affected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Supportlibsoup3, 0:3.6.5-3.el10_0.14affected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Supportlibsoup, 0:2.62.2-11.el7_9affected
Red HatRed Hat Enterprise Linux 8spice-client-win, 0:8.10-7affected
Red HatRed Hat Enterprise Linux 8libsoup, 0:2.62.3-13.el8_10affected
Red HatRed Hat Enterprise Linux 8libsoup, 0:2.62.3-13.el8_10affected
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Supportlibsoup, 0:2.62.3-1.el8_2.8affected
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Supportspice-client-win, 0:8.10-7.el8_2.1affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportlibsoup, 0:2.62.3-2.el8_4.8affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportspice-client-win, 0:8.10-7.el8_4.1affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onlibsoup, 0:2.62.3-2.el8_4.8affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onspice-client-win, 0:8.10-7.el8_4.1affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportlibsoup, 0:2.62.3-2.el8_6.8affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportspice-client-win, 0:8.10-7.el8_6.1affected
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Servicelibsoup, 0:2.62.3-2.el8_6.8affected
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Servicespice-client-win, 0:8.10-7.el8_6.1affected
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutionslibsoup, 0:2.62.3-2.el8_6.8affected
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutionsspice-client-win, 0:8.10-7.el8_6.1affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Servicelibsoup, 0:2.62.3-3.el8_8.8affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Servicespice-client-win, 0:8.10-7.el8_8.1affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionslibsoup, 0:2.62.3-3.el8_8.8affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionsspice-client-win, 0:8.10-7.el8_8.1affected
Red HatRed Hat Enterprise Linux 9libsoup, 0:2.72.0-12.el9_7.5affected
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP Solutionslibsoup, 0:2.72.0-8.el9_0.9affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutionslibsoup, 0:2.72.0-8.el9_2.10affected
Red HatRed Hat Enterprise Linux 9.4 Extended Update Supportlibsoup, 0:2.72.0-8.el9_4.9affected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Supportlibsoup, 0:2.72.0-10.el9_6.6affected
Red HatRed Hat OpenShift Dev Spaces (RHOSDS) 3.26devspaces/openvsx-rhel9, sha256:619c10386e0224e5228876a434c5b8d78d251bc383e2a9491503d6ceddd33c96affected
Red HatRed Hat OpenShift Dev Spaces (RHOSDS) 3.26devspaces/pluginregistry-rhel9, sha256:25de67b5c2c60597173d977b2a09ecd14a9b2d60c4fd24ac0c8bf3c1ac6c000eaffected
Weakness

CWE details

CWE-121

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-121 · source CWE mapping

Stack-based Buffer Overflow

Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs