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CVE-2025-1795Mishandling of comma during folding and unicode-encoding of email headers
- 2.3LowCVSS base score
- 0.63%Exploitation in 30 daysEPSS · top 49% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
During an address list folding when a separating comma ends up on a folded line and that line is to be unicode-encoded then the separator itself is also unicode-encoded. Expected behavior is that the separating comma remains a plan comma. This can result in the address header being misinterpreted by some mail servers.
Timeline
ID reserved
By PSF
Published
- 17 months later
· 17 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| PSFCNA (assigner) | 4.0 | Low2.3 | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N |
| NVDNVD · Deferred | 4.0 | Low2.3 | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/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 (exploitation in 30 days)
- 0.63% · top 49% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 2.3.
Affected products
Python Software Foundation · CPython
- affected < 3.9.23
- affected 3.10.0 – < 3.10.17
- affected 3.11.0 – < 3.11.9
- affected 3.12.0 – < 3.12.3
- affected 3.13.0a1 – < 3.13.0a5
References
References10
- https://github.com/python/cpython/issues/100884 (opens in a new tab)issue-tracking
- https://github.com/python/cpython/pull/100885 (opens in a new tab)patch
- https://github.com/python/cpython/pull/119099 (opens in a new tab)patch
- https://github.com/python/cpython/commit/09fab93c3d857496c0bd162797fab816c311ee48 (opens in a new tab)patch
- https://github.com/python/cpython/commit/70754d21c288535e86070ca7a6e90dcb670b8593 (opens in a new tab)patch
- https://github.com/python/cpython/commit/9148b77e0af91cdacaa7fe3dfac09635c3fe9a74 (opens in a new tab)patch
- https://mail.python.org/archives/list/[email protected]/thread/MB62IZMEC3UM6SGHP5LET5JX2Y7H4ZUR/ (opens in a new tab)vendor-advisory
- https://github.com/python/cpython/commit/a4ef689ce670684ec132204b1cd03720c8e0a03d (opens in a new tab)patch
- https://github.com/python/cpython/commit/d4df3c55e4c5513947f907f24766b34d2ae8c090 (opens in a new tab)patch
- https://lists.debian.org/debian-lts-announce/2025/03/msg00013.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-5930 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-1795)Record last updated .