CVE-2026-85783: CWE-770 Allocation of Resources Without Limits or Throttling
Description
Crypt::Age versions before 0.004 for Perl allow CPU exhaustion via an unbounded number of recipient stanzas, each costing an X25519 scalar multiplication in unwrap_file_key. The header parser accepts any number of recipient stanzas, and unwrap_file_key tries every identity against every X25519 stanza. Each attempt runs a scalar multiplication, an HKDF and a ChaCha20-Poly1305 open. The header MAC cannot be checked first, because its key comes from the file key, which only a successful unwrap produces. Each stanza is 98 bytes of attacker-chosen header and buys one scalar multiplication per identity held, and the file is rejected only after every one of them has run. A caller reaches this through decrypt, decrypt_file or decrypt_filehandle whenever it decrypts a file it did not write.
Affected software
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Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CPANSec
- Date Reserved
- 2026-09-04T16:29:19.634Z
- State
- PUBLISHED
Threat ID: 6ad7df022cdf04f656637d2f
Added to database: 10/20/2026, 21:37:06 UTC
Last updated: 10/21/2026, 01:04:52 UTC
Views: 4
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