Tie::Hash::Regex versions before 2.0.0 for Perl will throw an exception on unparseable…
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-248.
Summary
Tie::Hash::Regex versions before 2.0.0 for Perl will throw an exception on unparseable lookup keys. The FETCH, EXISTS and DELETE methods throw an exception when on malformed regular expressions. Each method falls back to a regex match when the key is not already stored in the hash, compiling the caller's key with a bare qr// and no eval guard. A key that is not a valid regular expression pattern, such as a single unmatched bracket, dies. An application that looks up externally supplied strings in a tied hash will die on an invalid key.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Tie-Hash-Regex | before 2.0.0 | 2.0.0 | Patch available | CNA |
- Tie-Hash-Regex Vendor— Affected before 2.0.0 Fixed in 2.0.0 Patch available CNA
Remediation
- Fix · CNA Tie-Hash-Regex Fixed in 2.0.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-77781
- 2026-10-03 Alias added: GHSA-fwmp-gxj5-29mj
References
Sources
- CVE-2026-77781 · CVE Program
- CVE-2026-77781 · NVD
- FIRST EPSS
- GHSA-fwmp-gxj5-29mj · GitHub Advisory Database · CC BY 4.0
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