CVSS 4.0
2.3 lowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:NCVE-2026-16052 Injection
Low (2.3). EPSS 0.3% estimated probability of exploitation activity in the next 30 days.
On this page
The http.cookies.Morsel class allows separator semicolons in attribute
values
and includes them verbatim in all output formats. An attacker who can
control
these values could use this to relax the cookie's Domain or SameSite
restrictions.
Severity
- EPSS
- 0.3% estimated probability of exploitation activity in the next 30 days; 24th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CWE
- CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)
- OWASP Top 10
- A05:2025 Injection
- Published
- Modified
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
Ask an AI about this CVE
Show the prompt
Explain CVE-2026-16052 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-16052?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-16052?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-16052 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Badge for a README or a site
An image that stays current: it is drawn from the data each time it is fetched (a host that proxies images, as GitHub does, may show its copy for a while). Markdown:
[](https://cve.bz/cve/CVE-2026-16052)
HTML:
<a href="https://cve.bz/cve/CVE-2026-16052"><img src="https://cve.bz/cve/badge/CVE-2026-16052.svg" alt="CVE-2026-16052"></a>
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Ubuntu | 22.04:LTS | python3.10 | no fix listed | UBUNTU-CVE-2026-16052 |
| Ubuntu | 24.04:LTS | python3.12 | no fix listed | UBUNTU-CVE-2026-16052 |
| Ubuntu | 26.04:LTS, 26.10 | python3.14 | no fix listed | UBUNTU-CVE-2026-16052 |
| Ubuntu | Pro:14.04:LTS | python2.7, python3.4, python3.5 | no fix listed | UBUNTU-CVE-2026-16052 |
| Ubuntu | Pro:16.04:LTS | python2.7, python3.5 | no fix listed | UBUNTU-CVE-2026-16052 |
| Ubuntu | Pro:18.04:LTS | python2.7, python3.6, python3.7 and 1 more | no fix listed | UBUNTU-CVE-2026-16052 |
| Ubuntu | Pro:20.04:LTS | python2.7, python3.8, python3.9 | no fix listed | UBUNTU-CVE-2026-16052 |
| Ubuntu | Pro:22.04:LTS | python2.7, python3.11 | no fix listed | UBUNTU-CVE-2026-16052 |
| Azure Linux | 3 | python-py | no fix listed | AZL-113807 |
| Azure Linux | 3 | python3 | no fix listed | AZL-113810 |
From the distributions' data via OSV.dev: Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; Microsoft's Azure Linux vulnerability data, MIT. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Ubuntu.
Attack patterns (CAPEC)
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits. More on the page of CWE-74 (37).