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CVE-2026-124249VulnerabilityPublished Updated

Python2.7: http.cookiejar.CookieJar deleted a stored cookie when a response carried an already expired Set-Cookie

Affects python2.7Source GCVE Database

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Authoritative record:CVE-2026-124249· Medium 6.3

Not known to be exploited · CVSS 6.3 Medium.

Data as of 13 Nov 2026, 22:04 UTC

CVSS 4.0 base score
6.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (PSF)CVSS 4.06.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10python3.14pkg:deb/ubuntu/python3.14?arch=source&distro=stonkingOther threatsAffected
  • 3.14.4-1 – 3.14.8-1ubuntu1
7 affected builds
Fixed in–
Ubuntu 26.04 LTSpython3.14pkg:deb/ubuntu/python3.14?arch=source&distro=resoluteOther threatsAffected
  • 3.14.0-1 – 3.14.4-1ubuntu0.2
11 affected builds
Fixed in–
Ubuntu 24.04 LTSpython3.12pkg:deb/ubuntu/python3.12?arch=source&distro=nobleOther threatsAffected
  • 3.12.0-1 – 3.12.3-1ubuntu0.17
26 affected builds
Fixed in–
Ubuntu 22.04 LTSpython3.10pkg:deb/ubuntu/python3.10?arch=source&distro=jammyOther threatsAffected
  • 3.10.0-2 – 3.10.12-1~22.04.18
35 affected builds
Fixed in–
Ubuntu Pro 22.04 LTSpython2.7pkg:deb/ubuntu/python2.7?arch=source&distro=esm-apps/jammyOther threatsAffected
  • 2.7.18-8build1 – 2.7.18-13ubuntu1.5+esm9
21 affected builds
Fixed in–
Ubuntu Pro 22.04 LTSpython3.11pkg:deb/ubuntu/python3.11?arch=source&distro=esm-apps/jammyOther threatsAffected
  • 3.11.0~rc1-1~22.04 – 3.11.0~rc1-1~22.04.1~esm9
13 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

http.cookiejar.CookieJar deleted a stored cookie when a response carried an already expired Set-Cookie header for it, using the Domain and Path attributes from the header without consulting the cookie policy. A server could therefore delete cookies belonging to other domains from a shared cookie jar, such as the one used by urllib's HTTPCookieProcessor. The fix consults the cookie policy before an expired cookie may delete an existing one, as required by RFC 6265 section 5.3.

References

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