CVE-2025-6278 json
Upsonic server.py os.path.join path traversal
published 2025-06-19 16 mo ago modified 2026-06-17 4 mo ago also GHSA-8jf4-fcjr-68c2 , PYSEC-2025-67 , EUVD-2025-18698
- cvss
- 5.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
A vulnerability classified as critical was found in Upsonic up to 0.55.6. This vulnerability affects the function os.path.join of the file markdown/server.py. The manipulation of the argument file.filename leads to path traversal. The exploit has been disclosed to the public and may be used.
Patch / fix
- pypi upsonic 0.56.0
- github.com/Upsonic/Upsonic@a54529a commit
- github.com/Upsonic/Upsonic#360 pull request
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 16 mo ago
Exploit prediction
0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/Upsonic/Upsonic/issues/356 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.1 | CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P |
| CNA | 3.1 | 5.5 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R |
| CNA | 3.0 | 5.5 | CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R |
| CNA | 2.0 | 5.2 | AV:A/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR |
| CNA | 4.0 | 2.0 | CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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 |
| CNA | 3.1 | 5.5 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 2.0 | 5.2 | AV:A/AC:L/Au:S/C:P/I:P/A:P |
| GitHub | 3.1 | 5.5 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | upsonic | <0.56.0 |
0.56.0 |
Affected products
- n/a Upsonic
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
github.com
/Upsonic/Upsonic/pull/360
web
-
github.com
/Upsonic/Upsonic/commit/a54529acc6e4bfe28f4f5c80c058144348a306b7
web
-
github.com
/Upsonic/Upsonic/issues/356
exploit, issue-tracking, web, evidence
-
vuldb.com
/?id.313282
vdb-entry, technical-description, web, third-party-advisory, advisory
-
vuldb.com
/?ctiid.313282
signature, permissions-required, web, vdb-entry, advisory
-
vuldb.com
/?submit.593096
third-party-advisory, web, vdb-entry, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-6278
advisory
-
github.com
/Upsonic/Upsonic
package
-
github.com
/Upsonic/Upsonic/blob/v0.55.6/src/upsonic/server/markdown/server/server.py#L39
web
-
github.com
/pypa/advisory-database/tree/main/vulns/upsonic/PYSEC-2025-67.yaml
web
-
github.com
/advisories/GHSA-8jf4-fcjr-68c2
advisory
Sources
- CVE List CVE-2025-6278
- GitHub Advisory GHSA-8jf4-fcjr-68c2
- NVD CVE-2025-6278
- OSV PYSEC-2025-67
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.