CVE-2026-124249
`http.cookiejar` applies expired `Set-Cookie` to cookie store before policy validation
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.
INFO
Published Date :
Nov. 9, 2026, 2:20 p.m.
Last Modified :
Nov. 9, 2026, 2:20 p.m.
Remotely Exploit :
Yes !
Source :
PSF
Affected Products
The following products are affected by CVE-2026-124249
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | 28c92f92-d60d-412d-b760-e73465c3df22 |
Solution
- Update the affected component to a new version.
- Ensure cookie policy checks occur before cookie deletion.
- Consult RFC 6265 section 5.3 for policy details.
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CVE-2026-124249 vulnerability anywhere in the article.