CVE-2026-78655
Punk::Plugin::TOTP versions before 0.05 for Perl allow the second-factor attempt limit to be reset by replaying an earlier session cookie because the challenge route counts failures in the session
- Published
- Updated
- Reserved
- Assigned by
- CPANSec
Description
Punk::Plugin::TOTP versions before 0.05 for Perl allow the second-factor attempt limit to be reset by replaying an earlier session cookie because the challenge route counts failures in the session. The POST handler on challenge_path keeps the failure count as tries inside the totp_pending record in the session, raising it on each rejected code and deleting the pending record once it reaches attempts, five by default. Punk::Session carries the session in a signed cookie unless the application declares a store, and keeps no server-side record, so an earlier value of the same session stays valid until the expiry stamped inside it. A client that saves the cookie before its failed attempts and presents it again gets the pending record back with its counter, and the limit never fires. The replayed record is accepted while its own expiry, pending_ttl seconds from the challenge and 300 by default, has not passed. Sessions declared with a store are not affected: the pending record and its counter then live server-side. The attempt limit does not bound guessing of the second factor, which is left to the per-address rate limit the plugin registers on the same path, 30 requests per 60 seconds.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Deferred | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.50% · top 57% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Weakness
Affected products
Punk-TOTP
- affected < 0.05
What to do
Solution: Upgrade to Punk-TOTP 0.05 or later, and add the two columns the count is kept in to the user table (totp_failed and totp_failed_at by default, named by fields).
Workaround: For deployments that cannot upgrade to 0.05, declare the session keyword with a store, which needs a Punk::Cache backend shared between workers. The cookie then carries only an opaque id and the counter is out of the client's reach.
References (5)
- https://metacpan.org/release/LNATION/Punk-TOTP-0.04/source/include/ptotp/ptotp_plugin.h (opens in a new tab)technical-description
- https://metacpan.org/release/LNATION/Punk-TOTP-0.04/view/lib/Punk/Plugin/TOTP.pm (opens in a new tab)technical-description
- https://metacpan.org/release/LNATION/Punk-0.32/view/lib/Punk/Session.pm (opens in a new tab)related
- https://metacpan.org/release/LNATION/Punk-TOTP-0.05/source/Changes (opens in a new tab)release-notes
- http://www.openwall.com/lists/oss-security/2026/08/25/7 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-78655)Record last updated .