Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2021-22922
n/a https://github.com/curl/curl — When curl is instructed to download content using the metalink feature, thecontents is verified against a hash provided in the metalink X…
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N R U N H N 6.5 .0433 91.1 —
AFFECTED
Product Versions Fixed
https://github.com/curl/curl curl 7.27.0 to and including 7.77.0 – —
TIMELINE
Jan 6 Reserved by hackerone
Aug 5 Published (CNA: hackerone)
Oct 14 EXPLOIT PUBLISHED — CVE-2021-22922 (https://github.com/curl/curl). Public exploit reference added.
Description
When curl is instructed to download content using the metalink feature, thecontents is verified against a hash provided in the metalink XML file.The metalink XML file points out to the client how to get the same contentfrom a set of different URLs, potentially hosted by different servers and theclient can then download the file from one or several of them. In a serial orparallel manner.If one of the servers hosting the contents has been breached and the contentsof the specific file on that server is replaced with a modified payload, curlshould detect this when the hash of the file mismatches after a completeddownload. It should remove the contents and instead try getting the contentsfrom another URL. This is not done, and instead such a hash mismatch is onlymentioned in text and the potentially malicious content is kept in the file ondisk.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| January 6, 2021 | Reserved | Reserved by hackerone |
| August 5, 2021 | Published | Published (CNA: hackerone) |
| October 14, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2021-22922 (https://github.com/curl/curl). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| n/a | https://github.com/curl/curl | — | curl 7.27.0 to and including 7.77.0 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-22922 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
