CVE-2026-82049tarfile extraction filters allow file modification and content disclosure via hard link to symlink
- 8.4HighCVSS base score
- 0.19%Exploitation in 30 daysEPSS · top 92% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may cause extraction to modify the permissions or modification time of a file outside the destination directory, or expose the contents of that file within the extracted tree.
Timeline
ID reserved
By PSF
- 18 days later
· 18 days later
Published
- 27 days later
· 27 days 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 | High8.4 | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| NVDNVD · Awaiting Analysis | 4.0 | High8.4 | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/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)
- 0.19% · top 92% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.
Affected products
Python Software Foundation · CPython
- affected < 3.10.22
- affected 3.11.0 – < 3.11.17
- affected 3.12.0 – < 3.12.15
- affected 3.13.0 – < 3.13.16
- affected 3.14.0a1 – < 3.14.0b1
References
References12
- https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca (opens in a new tab)patch
- https://github.com/python/cpython/issues/157190 (opens in a new tab)issue-tracking
- https://github.com/python/cpython/pull/157191 (opens in a new tab)patch
- https://mail.python.org/archives/list/[email protected]/thread/EFJWGAZJA56AKSBR2WHMHQZO7RRLZPRH/ (opens in a new tab)vendor-advisory
- https://github.com/python/cpython/commit/b38be2e6cf9d989075ab73412c63e003ebad4ff3 (opens in a new tab)patch
- https://github.com/python/cpython/commit/b8f23e307097552eaea2604383a12ab280520d0d (opens in a new tab)patch
- https://github.com/python/cpython/commit/197663d63afed27f66e10e23c194e8a634e60913 (opens in a new tab)patch
- https://github.com/python/cpython/commit/28f315486b3da0352b9a1de1c3c97f4127ba4771 (opens in a new tab)patch
- https://github.com/python/cpython/commit/c66df4e70435d257fd488b35ea129c6f317433a8 (opens in a new tab)patch
- https://github.com/python/cpython/commit/cc1689830c6b9aaddded2fb9f2fe8116867e2c0e (opens in a new tab)patch
- https://github.com/python/cpython/commit/cccc7ec30212dba2abef53ce4a2bed112ddb690c (opens in a new tab)patch
- http://www.openwall.com/lists/oss-security/2026/09/14/27 (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-2026-77772 (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-2026-82049)Record last updated .