"Crypt::DSA::Util::makerandom forces the high bit of every value it returns to obtain an exactly N-bit integer for prime search. The signing nonce and the private key are drawn from makerandom. Because the high bit is always set, the result is not uniform: its top bit is fixed, producing insecure values."
An attacker who collects a modest number of signatures under an affected key, together with the public key, can recover the private key with a lattice attack.
Keys used to sign with an affected version should be considered compromised and new keys should be generated.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| TIMLEGGE | Crypt::DSA | unaffected |
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| Vendors | Products |
|---|---|
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Timlegge
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Crypt::dsa
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Solution
Upgrade to version 1.22 or later, which draws the nonce and private key uniformly via rejection sampling (Crypt::DSA::Util::randombelow) with no forced high bit. Revoke and regenerate any keys used to sign with an affected version. Crypt::DSA was deprecated in version 1.20. You should migrate to another solution.
Workaround
No workaround given by the vendor.
Sun, 05 Jul 2026 03:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Timlegge
Timlegge crypt::dsa |
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| Vendors & Products |
Timlegge
Timlegge crypt::dsa |
Sun, 05 Jul 2026 02:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Crypt::DSA versions before 1.22 for Perl draw the DSA signing nonce and private key from a biased random generator, leading to private-key recovery. "Crypt::DSA::Util::makerandom forces the high bit of every value it returns to obtain an exactly N-bit integer for prime search. The signing nonce and the private key are drawn from makerandom. Because the high bit is always set, the result is not uniform: its top bit is fixed, producing insecure values." An attacker who collects a modest number of signatures under an affected key, together with the public key, can recover the private key with a lattice attack. Keys used to sign with an affected version should be considered compromised and new keys should be generated. | |
| Title | Crypt::DSA versions before 1.22 for Perl draw the DSA signing nonce and private key from a biased random generator, leading to private-key recovery | |
| Weaknesses | CWE-330 | |
| References |
|
Projects
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-07-05T05:19:58.316Z
Reserved: 2026-07-03T10:37:19.787Z
Link: CVE-2026-14570
Vulnrichment
No data.
NVD
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Redhat
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OpenCVE Enrichment
Updated: 2026-07-05T07:45:03Z