CVE-2026-1502 HTTP client proxy tunnel headers not validated for CR/LF
Attackers can inject CR/LF characters into HTTP proxy tunnel headers, potentially causing header injection or request smuggling.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-1502?
CVE-2026-1502 is a medium-severity vulnerability in CPython, published on 10 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
Weakness: CWE-93
Which versions are affected by CVE-2026-1502?
3 open source packages ship an affected version, including libpython, python and python-min.
| Package | Affected | Fixed in |
|---|---|---|
libpython Bitnami | All versions | 3.10.21, 3.11.16, 3.12.14, 3.13.14, 3.14.5 |
python Bitnami | All versions | 3.10.21, 3.11.16, 3.12.14, 3.13.14, 3.14.5 |
python-min Bitnami | All versions | 3.10.21, 3.11.16, 3.12.14, 3.13.14, 3.14.5 |
How do I fix CVE-2026-1502?
Upgrade libpython to a fixed version for your release line: 3.10.21, 3.11.16, 3.12.14 or 3.13.14.
Is CVE-2026-1502 being exploited?
There is no known exploitation of CVE-2026-1502 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-1502, AZL-82899, BELL-CVE-2026-1502, BIT-libpython-2026-1502, BIT-python-2026-1502, BIT-python-min-2026-1502 and 14 more.