CVE-2026-1502
CVE-2026-1502 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-93.
Key facts
- Severity: Medium (CVSS 4.0 base score 5.7)
- EPSS exploit prediction: 1% (43rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-21519
- Weakness: CWE-93
- Published:
- Last modified:
Description
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
Frequently asked questions
- What is CVE-2026-1502?
- CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
- How severe is CVE-2026-1502?
- CVE-2026-1502 has a CVSS 4.0 base score of 5.7, rated medium severity.
- Is CVE-2026-1502 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-1502?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-1502 have an EU (EUVD) identifier?
- Yes. CVE-2026-1502 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21519.
- When was CVE-2026-1502 published?
- CVE-2026-1502 was published on 2026-04-10 and last updated on 2026-06-30.
References
- https://github.com/python/cpython/commit/05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69
- https://github.com/python/cpython/commit/56b7100b04e44ea27989242b176beb8f016b2c53
- https://github.com/python/cpython/commit/58703ec1bdd1eb075e8b01a0c427683ce594dd3e
- https://github.com/python/cpython/commit/9e071c9b28c17f347f81b388a003d4eeb3c7a8dd
- https://github.com/python/cpython/commit/b1cf9016335cb637c5a425032e8274a224f4b2ed
- https://github.com/python/cpython/commit/c00c386faa579ad71196d33408644478488e43ec
- https://github.com/python/cpython/issues/146211
- https://github.com/python/cpython/pull/146212
- https://mail.python.org/archives/list/[email protected]/thread/2IVPAEQWUJBCTQZEJEVTYCIKSMQPGRZ3/
- http://www.openwall.com/lists/oss-security/2026/04/11/4
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