CVE-2026-75589 Affecting libnet-oauth-perl package, versions <0.33-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published19 Aug 2026
- disclosed19 Aug 2026
Introduced: 19 Aug 2026
CVE-2026-75589 (opens in a new tab)How to fix?
Upgrade Debian:unstable libnet-oauth-perl to version 0.33-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libnet-oauth-perl package and not the libnet-oauth-perl package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-75589
- https://github.com/vurtdev/Net-OAuth/commit/a1a16b58add85668ef4fcda642a486ceed098eba.patch
- https://github.com/vurtdev/Net-OAuth/security/advisories/GHSA-g8xr-69p3-gw56
- https://metacpan.org/release/RRWO/Net-OAuth-0.33/changes
- http://www.openwall.com/lists/oss-security/2026/08/19/3