--- title: "CVE-2026-1502\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2026-1502?format=md keywords: index, follow --- # CVE-2026-1502 Publication date 10 April 2026 Last updated 6 July 2026 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) Toggle side navigation ## Description CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host. ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | jython | 26.04 LTS resolute | Needs evaluation | | 25.10 questing | Ignored end of life, was needs-triage | | 24.04 LTS noble | Needs evaluation | | 22.04 LTS jammy | Needs evaluation | | 20.04 LTS focal | Needs evaluation | | 18.04 LTS bionic | Needs evaluation | | 16.04 LTS xenial | Needs evaluation | | pypy3 | 26.04 LTS resolute | Needs evaluation | | 25.10 questing | Ignored end of life, was needs-triage | | 24.04 LTS noble | Needs evaluation | | 22.04 LTS jammy | Needs evaluation | | 20.04 LTS focal | Needs evaluation | | python3.10 | 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 3.10.12-1~22.04.16 | | python3.12 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Fixed 3.12.3-1ubuntu0.15 | | 22.04 LTS jammy | Not in release | | python3.13 | 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 | 26.04 LTS resolute | Fixed 3.14.4-1ubuntu0.1 | | 25.10 questing | Ignored end of life, was needs-triage | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | | python2.7 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Needs evaluation | | 20.04 LTS focal | Needs evaluation | | 18.04 LTS bionic | Needs evaluation | | 16.04 LTS xenial | Needs evaluation | | 14.04 LTS trusty | Needs evaluation | | python3.11 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Needs evaluation | | python3.4 | 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 | Needs evaluation | | python3.5 | 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 | Needs evaluation | | 14.04 LTS trusty | Needs evaluation | | python3.6 | 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 | Needs evaluation | | python3.7 | 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 | Needs evaluation | | python3.8 | 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 | Needs evaluation | | 18.04 LTS bionic | Needs evaluation | | python3.9 | 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 | Needs evaluation | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) * [Patch details](https://ubuntu.com/security/CVE-2026-1502?format=md#patch-details) ### Patch details For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) | Package | Patch details | | --- | --- | | python3.12 | * Upstream: [c00c386](https://github.com/python/cpython/commit/c00c386faa579ad71196d33408644478488e43ec) | | python3.13 | * Upstream: [9e071c9](https://github.com/python/cpython/commit/9e071c9b28c17f347f81b388a003d4eeb3c7a8dd) | | python3.14 | * Upstream: [b1cf901](https://github.com/python/cpython/commit/b1cf9016335cb637c5a425032e8274a224f4b2ed) | ## Severity score breakdown CVSS version: CVSS v4.0 **Base score** 5.7 · Medium * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | Low | | Attack requirements | Present | | Privileges required | High | | User interaction | Passive | | Vulnerable system - Confidentiality impact | None | | Vulnerable system - Integrity impact | High | | Vulnerable system - Availability impact | None | | Subsequent system - Confidentiality impact | None | | Subsequent system - Integrity impact | None | | Subsequent system - Availability impact | None | * Scores | Parameter | Value | | --- | --- | | Base score | 5.7 · Medium | | Base + Threat score | - | | Base + Environmental score | - | | Base + Threat + Environmental score | - | **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 ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-1502) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-1502) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-1502) * [Debian](https://security-tracker.debian.org/tracker/CVE-2026-1502) ### Related Ubuntu Security Notices (USN) + [USN-8509-1](https://usn.ubuntu.com/USN-8509-1) + Python vulnerabilities + 6 July 2026 ### Other references * * * *