Mishandling of comma during folding and unicode-encoding of email headers
Summary
| CVE | CVE-2025-1795 |
|---|---|
| State | PUBLISHED |
| Assigner | PSF |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-02-28 19:15:36 UTC |
| Updated | 2026-07-31 14:16:44 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 2.3 LOW from [email protected]
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: 0.006000000 probability, percentile 0.453600000 (date 2026-08-03)
Problem Types: CWE-116 | CWE-116 CWE-116 Improper Encoding or Escaping of Output
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 2.3 | LOW | 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/C... |
| 4.0 | CNA | CVSS | 2.3 | LOW | 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 |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
HighAttack Requirements
PresentPrivileges Required
LowUser Interaction
NoneConfidentiality
LowIntegrity
NoneAvailability
NoneSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS: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
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Python Software Foundation | CPython | affected 3.9.23 python | Not specified |
| CNA | Python Software Foundation | CPython | affected 3.10.0 3.10.17 python | Not specified |
| CNA | Python Software Foundation | CPython | affected 3.11.0 3.11.9 python | Not specified |
| CNA | Python Software Foundation | CPython | affected 3.12.0 3.12.3 python | Not specified |
| CNA | Python Software Foundation | CPython | affected 3.13.0a1 3.13.0a5 python | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/python/cpython/pull/100885 | [email protected] | github.com | |
| lists.debian.org/debian-lts-announce/2025/03/msg00013.html | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | |
| github.com/python/cpython/commit/70754d21c288535e86070ca7a6e90dcb670b8593 | [email protected] | github.com | |
| mail.python.org/archives/list/[email protected]/thread/MB62IZMEC3U... | [email protected] | mail.python.org | |
| github.com/python/cpython/issues/100884 | [email protected] | github.com | |
| github.com/python/cpython/commit/a4ef689ce670684ec132204b1cd03720c8e0a03d | [email protected] | github.com | |
| github.com/python/cpython/commit/09fab93c3d857496c0bd162797fab816c311ee48 | [email protected] | github.com | |
| github.com/python/cpython/commit/d4df3c55e4c5513947f907f24766b34d2ae8c090 | [email protected] | github.com | |
| github.com/python/cpython/commit/9148b77e0af91cdacaa7fe3dfac09635c3fe9a74 | [email protected] | github.com | |
| github.com/python/cpython/pull/119099 | [email protected] | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.