CVE-2026-0865

Aliases:DEBIAN-CVE-2026-0865CGA-5pfv-hv35-95jqCGA-7hj3-jfg7-3vfgCGA-7m79-gpvx-q422CGA-h8h7-qrrj-5948CGA-m645-q47h-fr33CGA-p588-wj92-qq63CGA-3wcc-h63q-gf7rCGA-9hpg-jh3v-pxmqCGA-q3c4-qxcw-wvmrCGA-q6jq-fwfv-h3f6CGA-q8r6-gmg7-3v9gCGA-vgqh-m643-hmxg
Advisory lineage Upstream: 0 Downstream: 46
Deferred
Published: 20 Jan 2026, 21:26
Last modified:03 Mar 2026, 14:43

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
5.9 MEDIUM
v4.0 (cve.org)
EPSS Score
0.54% LOW
1% probability +0.41%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

20 Jan 2026, 21:26
Published
Vulnerability first disclosed
03 Mar 2026, 14:43
Last Modified
Vulnerability information updated

Description

User-controlled header names and values containing newlines can allow injecting HTTP headers.

CVSS Metrics

  • v4.0•MEDIUM•Score: 5.9CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
  • v4.0•MEDIUM•Score: 5.9CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/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

EPSS Trends

Current EPSS score: 0.54%• Percentile: 44%

Techniques & Countermeasures

  • CWE-74•Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

    The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

Affected Systems

  • chainguard•python-3.10

    < 3.10.19-r4

  • chainguard•python-3.11

    < 3.11.14-r5

  • chainguard•python-3.12

    < 3.12.12-r5

  • chainguard•python-3.13

    < 3.13.12-r1

  • chainguard•python-3.14

    < 3.14.3-r1

  • chainguard•python-3.9

    all

  • wolfi•python-3.10

    < 3.10.19-r4

  • wolfi•python-3.11

    < 3.11.14-r5

  • wolfi•python-3.12

    < 3.12.12-r5

  • wolfi•python-3.13

    < 3.13.12-r1

  • wolfi•python-3.14

    < 3.14.3-r1

  • debian•jython

    all | all | all | all

  • debian•pypy3

    all | all | all | < 7.3.21+dfsg-1

  • debian•python2.7

    all

  • debian•python3.11

    < 3.11.2-6+deb12u7

  • debian•python3.13

    < 3.13.5-2+deb13u1 | < 3.13.12-1

  • debian•python3.14

    < 3.14.3-1

  • debian•python3.9

    < 3.9.2-1+deb11u5

  • python software foundation•cpython

    < 3.15.0 | ≥ 3.15.0a1, < 3.15.0 | < 3.13.12 | < 3.10.20 | ≥ 3.11.0, < 3.11.15 | ≥ 3.12.0, < 3.12.13 | ≥ 3.13.0, < 3.13.12 | ≥ 3.14.0, < 3.14.3 | ≥ 3.15.0a1, < 3.15.0a6

References (18)