CVE-2026-112921
- Source
- https://cve.org/CVERecord?id=CVE-2026-112921
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-112921.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-112921
- Published
- 2026-10-21T21:37:54Z
- Modified
- 2026-10-22T10:45:47Z
- Summary
- Robots::Validate versions from 0.4.3 before 0.4.10 for Perl report clients as imposter robots when User-Agent matcher state carries over from a previous request
- Details
-
Robots::Validate versions from 0.4.3 before 0.4.10 for Perl report clients as imposter robots when User-Agent matcher state carries over from a previous request.
Each Robots::Validate object holds one pure-Perl Aho-Corasick search machine and feeds every User-Agent into it without resetting its state. A User-Agent that ends part-way through a robot name leaves the machine mid-match, so the next User-Agent checked by the same object can complete that name. That client's address is then checked against the robot's DNS rule, which it fails.
A remote client can use this to make a site that blocks bad robots block other visitors where the prefix User-Agent string is a suffix of a robot being validated.
Note that deployments with Algorithm::AhoCorasick::XS are also affected, since it was unused due to a different bug.
- Database specific
{ "cna_assigner": "CPANSec", "cwe_ids": [ "CWE-488" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112921.json", "unresolved_ranges": [ { "extracted_events": [ { "range": [ { "introduced": "0.4.3" }, { "fixed": "0.4.10" } ], "source": "AFFECTED_FIELD", "strategy": "StandardRange" } ] }, { "extracted_events": [ { "range": [ { "introduced": "0.4.3" }, { "fixed": "0.4.10" } ], "source": "DESCRIPTION" } ] } ] }- References
-
- http://www.openwall.com/lists/oss-security/2026/10/21/30
- https://cpan.org/modules
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112921.json
- https://github.com/robrwo/Robots-Validate
- https://github.com/robrwo/Robots-Validate/commit/776a1456e6605492b7582ed25d3d5006ef384402.patch
- https://metacpan.org/release/RRWO/Robots-Validate-v0.4.10/changes
- https://metacpan.org/release/RRWO/Robots-Validate-v0.4.11/changes
- https://nvd.nist.gov/vuln/detail/CVE-2026-112921
Affected packages
Git / github.com/robrwo/robots-validate
Affected ranges
- Type
- GIT
- Repo
- https://github.com/robrwo/robots-validate
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "fixed": "776a1456e6605492b7582ed25d3d5006ef384402" } ], "source": "REFERENCES_COMMIT" } ] }