Each of the three compares the signature carried in the message against the locally computed one with the eq operator, which returns as soon as the two strings differ. The time taken to reject a signature varies with the length of the matching prefix. RSA-SHA1 is not affected, as it verifies through the RSA key object rather than by comparing strings.
A client that can submit messages and time the replies may recover a valid signature one byte at a time rather than searching the whole signature space. Under PLAINTEXT the value compared against is the signature key itself, so the search recovers consumer_secret and token_secret.
Analysis
No analysis available yet.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| unaffected |
|
No data.
No data.
| Vendor | Product | Confidence | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Vurtdev | Net-oauth | 85% |
|
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Vendor Solution
Upgrade to Net-OAuth 0.33 or later.
Tracking
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No advisories yet.
Wed, 19 Aug 2026 11:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Vurtdev
Vurtdev net-oauth |
|
| Vendors & Products |
Vurtdev
Vurtdev net-oauth |
Wed, 19 Aug 2026 07:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Net::OAuth versions before 0.33 for Perl check HMAC-SHA1, HMAC-SHA256 and PLAINTEXT signatures with a non-constant-time comparison in verify. Each of the three compares the signature carried in the message against the locally computed one with the eq operator, which returns as soon as the two strings differ. The time taken to reject a signature varies with the length of the matching prefix. RSA-SHA1 is not affected, as it verifies through the RSA key object rather than by comparing strings. A client that can submit messages and time the replies may recover a valid signature one byte at a time rather than searching the whole signature space. Under PLAINTEXT the value compared against is the signature key itself, so the search recovers consumer_secret and token_secret. | |
| Title | Net::OAuth versions before 0.33 for Perl check HMAC-SHA1, HMAC-SHA256 and PLAINTEXT signatures with a non-constant-time comparison in verify | |
| Weaknesses | CWE-208 | |
| References |
|
MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-08-19T07:20:44.880Z
Reserved: 2026-08-17T22:30:33.360Z
Link: CVE-2026-75589
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-08-19T08:17:13.970
Modified: 2026-08-19T08:17:13.970
Link: CVE-2026-75589
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-08-19T11:15:16Z
-
CWE-208
Observable Timing Discrepancy