CPANSA-CallBackery-2026-118986: CallBackery vulnerability
| Publisher | giterlizzi | Document category | csaf_security_advisory |
|---|---|---|---|
| Initial release date | 2026-10-30T00:00:00 | Engine | CSAF Perl Toolkit 0.26 |
| Current release date | 2026-10-30T00:00:00 | Build Date | |
| Current version | 1 | Status | final |
| CVSS v3.1 Base Score | Severity | ||
| Original language | Language | en | |
| Also referred to | |||
Vulnerability Description
CallBackery versions before 0.62.0 for Perl allow session cookie forgery via a signing secret generated with rand().
The secret that signs session cookies is built from two calls to the built-in rand(), which is seeded with 32 bits. The secret therefore has at most 2**32 possible values, and one signed cookie is enough to test each candidate offline.
An attacker who obtains a single session cookie can recover the secret and sign cookies for any user, including an administrator.
Vulnerabilities
CVE-2026-118986
Vulnerability DescriptionCallBackery versions before 0.62.0 for Perl allow session cookie forgery via a signing secret generated with rand().
The secret that signs session cookies is built from two calls to the built-in rand(), which is seeded with 32 bits. The secret therefore has at most 2**32 possible values, and one signed cookie is enough to test each candidate offline.
An attacker who obtains a single session cookie can recover the secret and sign cookies for any user, including an administrator.
| Weakness | CWE-338 : Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) |
|---|
Product status
Known affected
| Product | Score | ||||
|---|---|---|---|---|---|
| CallBackery less than 0.62.0 |
|
Fixed
- CallBackery greater than or equal 0.62.0
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
- CPANSA-CallBackery-2026-118986 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-callbackery-2026-118986.json - https://metacpan.org/release/OETIKER/CallBackery-0.62.0/changes external
https://metacpan.org/release/OETIKER/CallBackery-0.62.0/changes - CVE-2026-118986 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2026-118986
Revision history
| Version | Date of the revision | Summary of the revision |
|---|---|---|
| 1 | Fri Oct 30 00:00:00 2026 | First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/