CVE-2026-1502
HTTP client proxy tunnel headers not validated for CR/LF
02 Description
HTTP client proxy tunnel headers not validated for CR/LF
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.56% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 46.4% of scored records. A rank, not a probability.
- NVD base score
- 5.7 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/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
- NVD analysis status
- Awaiting Analysis. NVD last modified this record on 2026-10-26.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-04-10 17:54Z6 MO AGO
- Last updated
- 2026-08-13 00:28Z2 MO AGO
- Reserved
- 2026-01-27
- Assigning CNA
- PSF
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.7)
- CNA CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- Weaknesses
- CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')Base
- Data version
- 5.2
- Document digest
- 44ff0c61bb835922ad31ef1a5c7100d1792df49ee26dd7b0e2dfdee46ae8d4d1
05 Affected products
06 References
- github.comhttps://github.com/python/cpython/pull/146212
- github.comhttps://github.com/python/cpython/issues/146211
- mail.python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/2IVPAEQWUJBCTQZEJEVTYCIKSMQPGRZ3/
- github.comhttps://github.com/python/cpython/commit/05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69
- github.comhttps://github.com/python/cpython/commit/b1cf9016335cb637c5a425032e8274a224f4b2ed
- github.comhttps://github.com/python/cpython/commit/9e071c9b28c17f347f81b388a003d4eeb3c7a8dd
- github.comhttps://github.com/python/cpython/commit/c00c386faa579ad71196d33408644478488e43ec
- github.comhttps://github.com/python/cpython/commit/56b7100b04e44ea27989242b176beb8f016b2c53
- github.comhttps://github.com/python/cpython/commit/58703ec1bdd1eb075e8b01a0c427683ce594dd3e
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/04/11/4
07 Fixed in
AlmaLinux 8
- python3.12 Fixed in 3.12.13-2.el8_10
- python3.12-debug Fixed in 3.12.13-2.el8_10
- python3.12-devel Fixed in 3.12.13-2.el8_10
- python3.12-idle Fixed in 3.12.13-2.el8_10
- python3.12-libs Fixed in 3.12.13-2.el8_10
- python3.12-rpm-macros Fixed in 3.12.13-2.el8_10
- python3.12-test Fixed in 3.12.13-2.el8_10
- python3.12-tkinter Fixed in 3.12.13-2.el8_10
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- python3.12 Fixed in 3.12.13-2.el9_8
- python3.12-debug Fixed in 3.12.13-2.el9_8
- python3.12-devel Fixed in 3.12.13-2.el9_8
- python3.12-idle Fixed in 3.12.13-2.el9_8
- python3.12-libs Fixed in 3.12.13-2.el9_8
- python3.12-test Fixed in 3.12.13-2.el9_8
- python3.12-tkinter Fixed in 3.12.13-2.el9_8
- python3.14 Fixed in 3.14.4-2.el9_8
- python3.14-debug Fixed in 3.14.4-2.el9_8
- python3.14-devel Fixed in 3.14.4-2.el9_8
- python3.14-freethreading Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-debug Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-devel Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-idle Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-libs Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-test Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-tkinter Fixed in 3.14.4-2.el9_8
- python3.14-idle Fixed in 3.14.4-2.el9_8
- python3.14-libs Fixed in 3.14.4-2.el9_8
- python3.14-test Fixed in 3.14.4-2.el9_8
- python3.14-tkinter Fixed in 3.14.4-2.el9_8
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- python-unversioned-command Fixed in 3.12.13-2.el10_2
- python3 Fixed in 3.12.13-2.el10_2
- python3-debug Fixed in 3.12.13-2.el10_2
- python3-devel Fixed in 3.12.13-2.el10_2
- python3-idle Fixed in 3.12.13-2.el10_2
- python3-libs Fixed in 3.12.13-2.el10_2
- python3-test Fixed in 3.12.13-2.el10_2
- python3-tkinter Fixed in 3.12.13-2.el10_2
- python3.14 Fixed in 3.14.4-2.el10_2
- python3.14-debug Fixed in 3.14.4-2.el10_2
- python3.14-devel Fixed in 3.14.4-2.el10_2
- python3.14-freethreading Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-debug Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-devel Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-idle Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-libs Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-test Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-tkinter Fixed in 3.14.4-2.el10_2
- python3.14-idle Fixed in 3.14.4-2.el10_2
- python3.14-libs Fixed in 3.14.4-2.el10_2
- python3.14-test Fixed in 3.14.4-2.el10_2
- python3.14-tkinter Fixed in 3.14.4-2.el10_2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- python3.12 Fixed in 3.12.13-2.el8_10
- python3.12-debug Fixed in 3.12.13-2.el8_10
- python3.12-devel Fixed in 3.12.13-2.el8_10
- python3.12-idle Fixed in 3.12.13-2.el8_10
- python3.12-libs Fixed in 3.12.13-2.el8_10
- python3.12-rpm-macros Fixed in 3.12.13-2.el8_10
- python3.12-test Fixed in 3.12.13-2.el8_10
- python3.12-tkinter Fixed in 3.12.13-2.el8_10
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- python3.12 Fixed in 3.12.13-2.el9_8
- python3.12-debug Fixed in 3.12.13-2.el9_8
- python3.12-devel Fixed in 3.12.13-2.el9_8
- python3.12-idle Fixed in 3.12.13-2.el9_8
- python3.12-libs Fixed in 3.12.13-2.el9_8
- python3.12-test Fixed in 3.12.13-2.el9_8
- python3.12-tkinter Fixed in 3.12.13-2.el9_8
- python3.14 Fixed in 3.14.4-2.el9_8
- python3.14-debug Fixed in 3.14.4-2.el9_8
- python3.14-devel Fixed in 3.14.4-2.el9_8
- python3.14-freethreading Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-debug Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-devel Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-idle Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-libs Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-test Fixed in 3.14.4-2.el9_8
- python3.14-freethreading-tkinter Fixed in 3.14.4-2.el9_8
- python3.14-idle Fixed in 3.14.4-2.el9_8
- python3.14-libs Fixed in 3.14.4-2.el9_8
- python3.14-test Fixed in 3.14.4-2.el9_8
- python3.14-tkinter Fixed in 3.14.4-2.el9_8
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- python-unversioned-command Fixed in 3.12.13-2.el10_2
- python3 Fixed in 3.12.13-2.el10_2
- python3-debug Fixed in 3.12.13-2.el10_2
- python3-devel Fixed in 3.12.13-2.el10_2
- python3-idle Fixed in 3.12.13-2.el10_2
- python3-libs Fixed in 3.12.13-2.el10_2
- python3-test Fixed in 3.12.13-2.el10_2
- python3-tkinter Fixed in 3.12.13-2.el10_2
- python3.14 Fixed in 3.14.4-2.el10_2
- python3.14-debug Fixed in 3.14.4-2.el10_2
- python3.14-devel Fixed in 3.14.4-2.el10_2
- python3.14-freethreading Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-debug Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-devel Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-idle Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-libs Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-test Fixed in 3.14.4-2.el10_2
- python3.14-freethreading-tkinter Fixed in 3.14.4-2.el10_2
- python3.14-idle Fixed in 3.14.4-2.el10_2
- python3.14-libs Fixed in 3.14.4-2.el10_2
- python3.14-test Fixed in 3.14.4-2.el10_2
- python3.14-tkinter Fixed in 3.14.4-2.el10_2
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- pypy3 No fix yet
- python3.11 Fixed in 3.11.2-6+deb12u9
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- pypy3 No fix yet
- python3.13 Fixed in 3.13.5-2+deb13u3
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- pypy3 Fixed in 7.3.22+dfsg-1
- python3.13 Fixed in 3.13.14-1
- python3.14 Fixed in 3.14.5-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- jython No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- jython No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- jython No fix yet
- pypy3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- jython No fix yet
- pypy3 No fix yet
- python3.10 Fixed in 3.10.12-1~22.04.16
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- jython No fix yet
- pypy3 No fix yet
- python3.12 Fixed in 3.12.3-1ubuntu0.15
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- jython No fix yet
- pypy3 No fix yet
- python3.13 No fix yet
- python3.14 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- jython No fix yet
- pypy3 No fix yet
- python3.14 Fixed in 3.14.4-1ubuntu0.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.10
- jython No fix yet
- pypy3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- python2.7 No fix yet
- python3.4 No fix yet
- python3.5 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- python2.7 No fix yet
- python3.5 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- python2.7 No fix yet
- python3.6 No fix yet
- python3.7 No fix yet
- python3.8 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- python2.7 No fix yet
- python3.8 No fix yet
- python3.9 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 22.04 LTS
- python2.7 No fix yet
- python3.11 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.