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Public proof of conceptFix available

CVE-2026-49264

A public proof of concept exists; no exploitation attested.

  • Published2026-10-13
  • Fixed in4.0.0
  • WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 0.6.1 until 4.0.0, OAuthLib's RevocationEndpoint in oauthlib/oauth2/rfc6749/endpoints/revocation.py reflects an unvalidated callback request parameter into success and error response bodies when enable_jsonp=True. The callback can come from the query string or request body and is used without restricting it to a legal JavaScript function name. A browser application that loads the revocation response as trusted JSONP and permits attacker influence over callback can therefore execute attacker-controlled JavaScript in the including application's origin, with access to its DOM and script-accessible data. The feature is disabled by default, so only deployments that explicitly enable JSONP are affected. This issue is fixed in version 4.0.0.

Timeline

dates in UTC
  1. 2026-10-1316:17CVE publishedNVD

Versions per branch

OSV
oauthlib
BranchAffectedFixed in
4.0≥ 0.6.1, < 4.0.04.0.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • oauthlib
    Affected
    • = >= 0.6.1, < 4.0.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-10-13

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • airflow-2MinimOSall versions · no fixed version listedand 13 other packages
  • airflow-3CleanStartall versions · fixed in 3.0.6-r9
  • airflow-3CleanStartall versions · fixed in 3.1.8-r13
  • airflow-3CleanStartall versions · fixed in 3.2.1-r11
  • airflow-3CleanStartall versions · fixed in 3.2.2-r8
  • airflow-3CleanStartall versions · fixed in 3.3.2-r1
  • ansible-operatorChainguardall versions · fixed in 1.42.3-r18
  • ansible-operator-fipsChainguardall versions · fixed in 1.42.3-r15

116 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-49264 Red Hat Product Security9 products fixed · 244 known affected

    oauthlib: oauthlib: Unsafe JSONP callback injection in RevocationEndpoint allows arbitrary JavaScript response generation

    openshift-sandboxed-containers/osc-podvm-builder-rhel9 as a component of Confidential Compute Attestation · workload-availability/fence-agents-remediation-rhel9-operator as a component of Fence Agents Remediation Operator · lightspeed-core/lightspeed-stack-rhel9 as a component of Lightspeed Core · +241 more

  • RHSA-2026:92452 Red Hat Product Security5 products fixed

    Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.5.2 enhancement update

  • RHSA-2026:92449 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.5.2 enhancement update

  • RHSA-2026:82415 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AI Inference 3.5.2 (cpu)

  • RHSA-2026:82368 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat AI Inference 3.5.2 (cuda)

Full record on NVD

Fix

  1. Update oauthlib to 4.0.0
  2. Vendor fix Red Hat Product Security RHSA-2026:92452 · 5 productsThe container images provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command. For details on deploying and configuring RHEL AI, see the Red Hat Enterprise Linux AI documentation at https://docs.redhat.com/en/documentation/…
  3. Vendor fix Red Hat Product Security RHSA-2026:92449 · 1 productThe container disk images provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command, for use with OpenShift Virtualization. For details on deploying and configuring RHEL AI, see the Red Hat Enterprise Linux AI documentation …
  4. Vendor fix Red Hat Product Security RHSA-2026:82415 · 1 productFor more information visit https://access.redhat.com/errata/RHSA-2026:82415
  5. Vendor fix Red Hat Product Security RHSA-2026:82368 · 2 productsFor more information visit https://access.redhat.com/errata/RHSA-2026:82368
  6. Workaround from the vendor Red Hat Product Security RHSA-2026:92452 · 7 productsJSONP support on oauthlib's token revocation endpoint is opt-in and disabled by default. Deployments can mitigate this issue by not enabling it: ensure enable_jsonp=True is not passed when constructing oauthlib's RevocationEndpoint, so that user-supplied callback parameters are never reflected into…
  7. No fix available, says the vendor Red Hat Product Security CVE-2026-49264 · 244 productsFix deferred

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-10-16
  • CNACVSS 3.16.1known since 2026-10-23
  • CNAweakness (CWE)CWE-79known since 2026-10-23
  • FIRST EPSSEPSS score0.2 %2026-11-05
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2026-09-29

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published
2026-10-13
Last Modified
2026-10-16
NVD status
Deferred
GitHub Advisory
GHSA-hj66-6f7g-4r5v

Frequently asked questions

What is CVE-2026-49264?

OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 0.6.1 until 4.0.0, OAuthLib's RevocationEndpoint in oauthlib/oauth2/rfc6749/endpoints/revocation.py reflects an unvalidated callback request parameter into success and error response bodies when enable_jsonp=True. The callback can come from the query string or request body and is used without restricting it to a legal JavaScript function name. A browser application that loads the revocation response as trusted JSONP and permits attacker influence over callback can therefore execute attacker-controlled JavaScript in the including application's origin, with access to its DOM and script-accessible data. The feature is disabled by default, so only deployments that explicitly enable JSONP are affected. This issue is fixed in version 4.0.0.

Is CVE-2026-49264 actively exploited?

A proof-of-concept exploit exists for CVE-2026-49264, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-49264?

CVE-2026-49264 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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