CVE-2026-82049Disclosure

LOWCVSS 8.4 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-59

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Full discourse1 post

Upwind Security MDR@UpwindMDR45d
Disclosure
🚨High - CPython tarfile Filter Bypass via Hardlink-to-Symlink (CVE-2026-82049) In CPython tarfile.extractall(), extraction filters can be bypassed with a crafted tar containing a hard link targeting a symlink, causing chmod/utime to apply to a file outside the destination dir or exposing its contents via the extracted tree. Non-link entries aren’t affected. 👉Affected: CPython <= 3.13
Post summary
The tweet discloses a high-severity filter bypass vulnerability in CPython's tarfile.extractall() (CVE-2026-82049) where a crafted tar with a hard link to a symlink can bypass extraction limits, affecting versions up to 3.13. No exploit, patch, or active exploitation is mentioned.
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