Upstream information
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.
SUSE information
Overall state of this security issue: Resolved
This issue is currently rated as having moderate severity.
SUSE Bugzilla entry: 1275651 [NEW] No SUSE Security Announcements cross referenced.List of released packages
| Product(s) | Fixed package version(s) | References |
|---|---|---|
| openSUSE Tumbleweed |
| Patchnames: openSUSE-Tumbleweed-2026-11551 |
SUSE Timeline for this CVE
CVE page created: Thu Aug 20 21:20:05 2026CVE page last modified: Mon Aug 24 22:17:00 2026