CVE-2026-3644

Publication date 16 March 2026

Last updated 10 September 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Description

The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().

Status

Package Ubuntu Release Status
python2.7 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy
Fixed in 2.7.18-13ubuntu1.5+esm9
20.04 LTS focal
Fixed in 2.7.18-1~20.04.7+esm10
18.04 LTS bionic
Fixed in 2.7.17-1~18.04ubuntu1.13+esm15
16.04 LTS xenial
Fixed in 2.7.12-1ubuntu0~16.04.18+esm22
14.04 LTS trusty
Fixed in 2.7.6-8ubuntu0.6+esm30
python3.4 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
14.04 LTS trusty
Fixed in 3.4.3-1ubuntu1~14.04.7+esm21
python3.5 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
16.04 LTS xenial
Fixed in 3.5.2-2ubuntu0~16.04.13+esm25
14.04 LTS trusty
Fixed in 3.5.2-2ubuntu0~16.04.4~14.04.1+esm11
python3.6 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
18.04 LTS bionic
Fixed in 3.6.9-1~18.04ubuntu1.13+esm10
python3.7 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
18.04 LTS bionic
Fixed in 3.7.5-2ubuntu1~18.04.2+esm11
python3.8 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal
Fixed in 3.8.10-0ubuntu1~20.04.18+esm7
18.04 LTS bionic
Fixed in 3.8.0-3ubuntu1~18.04.2+esm11
python3.9 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal
Fixed in 3.9.5-3ubuntu0~20.04.1+esm11
python3.10 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy
Fixed in 3.10.12-1~22.04.16
python3.11 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy
Fixed in 3.11.0~rc1-1~22.04.1+esm2
python3.12 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble
Fixed in 3.12.3-1ubuntu0.15
22.04 LTS jammy Not in release
python3.13 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Ignored end of life, was needs-triage
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
python3.14 26.10 stonking
Not affected
26.04 LTS resolute
Not affected
25.10 questing Ignored end of life, was needs-triage
24.04 LTS noble Not in release
22.04 LTS jammy Not in release

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
python3.12

Severity score breakdown

CVSS version:

Base score 6.0 · Medium

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

Base score 7.5 · High

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

Other references

Access our resources on patching vulnerabilities