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deps: pin oauthlib>=4.0.0 (CVE-2026-49264, CVE-2026-49265) - #2721

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deps: pin oauthlib>=4.0.0 (CVE-2026-49264, CVE-2026-49265)#2721
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@friedrichwilken friedrichwilken commented Oct 1, 2026

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Fixes #2720.

Two CVEs affect oauthlib 3.x:

  • CVE-2026-49265 -- Timing attack in PKCE code_verifier comparison (CWE-208)
  • CVE-2026-49264 -- Unsafe JSONP callback injection in RevocationEndpoint

The chain is kubernetes → requests-oauthlib → oauthlib>=3.0.0. Since requests-oauthlib only requires >=3.0.0, resolvers can land on the vulnerable 3.x line without a tighter constraint here.

The upstream fix is requests/requests-oauthlib#577 (bump their own lower bound to >=4.0.0), but that project is slow-moving. This PR adds the same protective direct pin used in #2016, following the same pattern that #2434 later cleaned up once the underlying issue was resolved.

The pin can be removed once requests-oauthlib ships a release with oauthlib>=4.0.0 in its own requirements.

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Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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@kubernetes-prow kubernetes-prow Bot added do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. needs-kind Indicates a PR lacks a `kind/foo` label and requires one. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Oct 1, 2026
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@kubernetes-prow kubernetes-prow Bot added the size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. label Oct 1, 2026
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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: friedrichwilken
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kubernetes-prow Bot requested review from roycaihw and yliaog October 1, 2026 15:09
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Security: pin oauthlib>=4.0.0 (CVE-2026-49264, CVE-2026-49265)

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