CVE-2026-23879
Arbitrary file write via crafted symlinks in py7zr <=1.1.2 during extraction.
Is CVE-2026-23879 being exploited?
Not confirmed. CVE-2026-23879 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.57% probability of exploitation in the next 30 days.
How severe is CVE-2026-23879?
CVE-2026-23879 is rated High with a CVSS score of 8.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-23879?
Yes. A fix has been recorded for CVE-2026-23879. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-23879 affect?
CVE-2026-23879 affects py7zr <=1.1.2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-23879?
Upgrade to 1.1.3+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Arbitrary file writes via symlink traversal during extractall; may enable RCE or privilege escalation with crafted archives.
Patch when possible
- affected< 1.1.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.