CVE-2026-1502: HTTP client proxy tunnel headers not validated for CR/LF
Awaiting analysis
AliasesALPINE-CVE-2026-1502UBUNTU-CVE-2026-1502DEBIAN-CVE-2026-1502CGA-67c6-67fc-p42gCGA-67mx-h3fh-x4cqCGA-7q5f-rxwg-6762CGA-944x-jfx5-h2p9CGA-f3fh-hj7q-j4cfCGA-fh47-vhf7-3mpvCGA-g74q-55r5-9jc3CGA-h9qm-m7fg-c98xCGA-j5x6-6r26-p78gCGA-r9fr-wc8w-5rr5CGA-7qqf-5wmc-5r5hCGA-ghg8-6h86-m46j
Published 10-04-2026Last modified 13-08-2026
Vulnerability summary
CVE-2026-1502 is a medium (CVSS 5.7) vulnerability in python software foundation cpython. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 46.8% of scored vulnerabilities.
Priority
Routine
Not severe (CVSS 5.7, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?CVSS score
5.7/10
010
Medium · v4.0 (CVE.org)EPSS score
0.56%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 33 · Related 24MGASA-2026-0455OPENSUSE-SU-2026:10647-1OPENSUSE-SU-2026:10648-1OPENSUSE-SU-2026:10667-1OPENSUSE-SU-2026:11068-1OPENSUSE-SU-2026:11100-1OPENSUSE-SU-2026:11181-1OPENSUSE-SU-2026:21459-1RHSA-2026:10117RHSA-2026:10950RHSA-2026:19019RHSA-2026:19064RHSA-2026:19176RHSA-2026:19177RHSA-2026:8822RHSA-2026:8824RHSA-2026:9228SUSE-SU-2026:22959-1SUSE-SU-2026:23191-1SUSE-SU-2026:23212-1SUSE-SU-2026:23743-1SUSE-SU-2026:2464-1SUSE-SU-2026:3104-1SUSE-SU-2026:3132-1SUSE-SU-2026:3855-1SUSE-SU-2026:4534-1SUSE-SU-2026:4580-1SUSE-SU-2026:4581-1SUSE-SU-2026:4582-1SUSE-SU-2026:4583-1SUSE-SU-2026:4584-1SUSE-SU-2026:4585-1USN-8509-1CGA-F3XQ-534H-274W
Timeline
- 10-04-2026PublishedVulnerability first disclosed.
- 13-08-2026Last modifiedVulnerability information updated.
Description
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
CVSS metrics
7 scores · 7 sources · 1 versionMedium 5.7Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:NSourcesAll 7 agree
- OSV · AlpineEcosystem advisory · calculated5.7MediumCVSS: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
- OSV · UbuntuEcosystem advisory · calculated5.7MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- OSV · DebianEcosystem advisory · calculated5.7MediumCVSS: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
- OSV · WolfiEcosystem advisory · calculated5.7MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated5.7MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- NVDNIST5.7MediumCVSS: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
EPSS trend
Probability
0.56%
Chance of exploitation in the next 30 days
Percentile
47%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.56% on 04-10-2026
04-10-202603-11-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Version check
Known conditions: network-reachable, administrative account, user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu14 products
- jythonAll versions (No fix recorded)
- pypy3All versions (No fix recorded)
- python2.7All versions (No fix recorded)
- python3.10< 3.10.12-1~22.04.16
- python3.11All versions (No fix recorded)
Chainguard6 products
- python-3.10< 3.10.20-r4
- python-3.11< 3.11.15-r9
- python-3.12< 3.12.13-r3
- python-3.13< 3.13.13-r2
- python-3.14< 3.14.4-r3
Wolfi5 products
- python-3.10< 3.10.20-r4
- python-3.11< 3.11.15-r9
- python-3.12< 3.12.13-r3
- python-3.13< 3.13.13-r2
- python-3.14< 3.14.4-r3
Debian4 products
- pypy3All versions (No fix recorded) | < 7.3.22+dfsg-1
- python3.11< 3.11.2-6+deb12u9
- python3.13< 3.13.14-1 | < 3.13.5-2+deb13u3
- python3.14< 3.14.5-1
Alpine1 product
- python3< 3.12.14-r0
Python software foundation1 product
- cpython< 3.10.21 | ≥ 3.11.0, < 3.11.16 | ≥ 3.12.0, < 3.12.14 | ≥ 3.13.0, < 3.13.14 | ≥ 3.14.0a1, < 3.14.5rc1 | ≥ 3.15.0a1, < 3.15.0b1
6 vendors · 31 products
References
18 links- mail.python.org/archives/list/security-announce@python.org/thread/2IVPAEQWUJBCTQZEJEVTYCIKSMQPGRZ3/Vendor AdvisoryREPORTAdvisory
Show all 18 references
- github.com/python/cpythonPACKAGE