CVE-2026-3644

Aliases:UBUNTU-CVE-2026-3644DEBIAN-CVE-2026-3644ALPINE-CVE-2026-3644CGA-3rjg-h44j-w26vCGA-6q68-qxxc-rv68CGA-7g42-jfcw-ccgwCGA-975c-63xh-w2w9CGA-977h-c34r-5v9jCGA-9vxg-2373-8rm4CGA-cc9q-49v3-r42fCGA-gx3f-vf78-qvcrCGA-jwvc-775q-2843CGA-fgvw-2hh6-gqj7CGA-vr9r-627r-wx6cCGA-xmp7-w2cj-8ggh
Advisory lineage Upstream: 0 Downstream: 34
Modified
Published: 16 Mar 2026, 17:37
Last modified:13 Aug 2026, 00:27

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.1 (nvd)
EPSS Score
0.48% LOW
0% probability +0.42%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

16 Mar 2026, 17:37
Published
Vulnerability first disclosed
13 Aug 2026, 00:27
Last Modified
Vulnerability information updated

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().

CVSS Metrics

  • v4.0•MEDIUM•Score: 6CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
  • v4.0•MEDIUM•Score: 6CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Trends

Current EPSS score: 0.48%• Percentile: 40%

Techniques & Countermeasures

  • CWE-20•Improper Input Validation

    The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

  • CWE-116•Improper Encoding or Escaping of Output

    The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

Affected Systems

  • alpine•python3

    < 3.12.14-r0 | < 3.12.14-r0 | < 3.12.14-r0 | < 3.14.5-r0

  • chainguard•python-3.10

    all | < 3.10.21-r6

  • chainguard•python-3.11

    < 3.11.15-r9

  • chainguard•python-3.12

    all | < 3.12.14-r8

  • chainguard•python-3.13

    < 3.13.12-r7

  • chainguard•python-3.14

    < 3.14.3-r6

  • chainguard•python-3.9

    all

  • wolfi•python-3.10

    all | < 3.10.21-r6

  • wolfi•python-3.11

    < 3.11.15-r9

  • wolfi•python-3.12

    all | < 3.12.14-r8

  • wolfi•python-3.13

    < 3.13.12-r7

  • wolfi•python-3.14

    < 3.14.3-r6

  • debian•python3.11

    all

  • debian•python3.13

    < 3.13.5-2+deb13u2 | < 3.13.14-1

  • debian•python3.14

    < 3.14.3-4

  • debian•python3.9

    < 3.9.2-1+deb11u7

  • ubuntu•python2.7

    all | < 2.7.6-8ubuntu0.6+esm30 | < 2.7.12-1ubuntu0~16.04.18+esm22 | < 2.7.17-1~18.04ubuntu1.13+esm15 | < 2.7.18-13ubuntu1.5+esm9

  • ubuntu•python3.10

    < 3.10.12-1~22.04.16

  • ubuntu•python3.11

    all | all | < 3.11.0~rc1-1~22.04.1+esm2

  • ubuntu•python3.12

    < 3.12.3-1ubuntu0.15

  • ubuntu•python3.13

    all

  • ubuntu•python3.14

    all

  • ubuntu•python3.4

    all | < 3.4.3-1ubuntu1~14.04.7+esm21

  • ubuntu•python3.5

    all | < 3.5.2-2ubuntu0~16.04.4~14.04.1+esm11 | < 3.5.2-2ubuntu0~16.04.13+esm25

  • ubuntu•python3.6

    all | < 3.6.9-1~18.04ubuntu1.13+esm10

  • ubuntu•python3.7

    all | < 3.7.5-2ubuntu1~18.04.2+esm11

  • ubuntu•python3.8

    all | < 3.8.0-3ubuntu1~18.04.2+esm11 | < 3.8.10-0ubuntu1~20.04.18+esm7

  • ubuntu•python3.9

    all | < 3.9.5-3ubuntu0~20.04.1+esm11

  • python software foundation•cpython

    < 3.15.0 | < 3.14.4 | < 3.13.13 | < 3.10.21 | ≥ 3.11.0, < 3.11.16 | ≥ 3.12.0, < 3.12.14 | ≥ 3.13.0, < 3.13.13 | ≥ 3.14.0, < 3.14.4 | ≥ 3.15.0a1, < 3.15.0a8

  • python•python

    < 3.13.13 | ≥ 3.14.0, < 3.14.4 | 3.15.0:alpha1 | 3.15.0:alpha2 | 3.15.0:alpha3 | 3.15.0:alpha4 | 3.15.0:alpha5 | 3.15.0:alpha6 | 3.15.0:alpha7

References (18)