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Google: dev-python/oauthlib: security update to 19216.739.5

medium Tenable Cloud Security Plugin ID 474925

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 3.0.0 until 4.0.0,
 OAuthLib's PKCE checks in oauthlib/oauth2/rfc6749/grant_types/authorization_code.py compare attacker-
 supplied code_verifier values with stored challenges using ordinary string equality in
 code_challenge_method_plain and code_challenge_method_s256. Because the comparison can return after a
 length difference or the first mismatching character, repeated token endpoint measurements can reveal
 common-prefix timing information that could potentially allow recovery of the code_verifier, unauthorized
 access-token acquisition, and account takeover. Practical exploitation requires an intercepted, single-use
 authorization code and enough measurements to overcome real-world network noise; the local timing
 benchmark does not establish practical remote account takeover, so the weakness remains a defense-in-depth
 concern. This issue is fixed in version 4.0.0. (CVE-2026-49265)

Solution

Update the dev-python/oauthlib library and its related packages to version 19216.739.5 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-125.oval.xml.tar.gz

Plugin Details

Severity: Medium

ID: 474925

Version: Revision 1.1

Type: Local

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.45

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-49265

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 9/29/2026

Reference Information

CVE: CVE-2026-49265