CVE-2020-28949 — PEAR Archive_Tar Deserialization of Untrusted Data Vulnerability
Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks, and thus any other stream-wrapper attack (such as file:// to overwrite files) can still succeed.
Published
2020-11-19T18:14:18.000Z
Last modified
2025-10-21T23:35:32.687Z
CISA KEV — Actively Exploited
01What is this vulnerability?
Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks, and thus any other stream-wrapper attack (such as file:// to overwrite files) can still succeed.
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / n/a | n/a |
03Active exploitation status
Yes — actively exploited. Added to the CISA KEV catalog on 2022-08-25. Ransomware use: Unknown.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:
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07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2020-11-19T18:14:18.000Z
- Last modified: 2025-10-21T23:35:32.687Z
- Added to CISA KEV: 2022-08-25
- BOD 22-01 due: 2022-09-15
09References
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