CVE-2026-118986
CallBackery versions before 0.62.0 for Perl allow session cookie forgery via a signing secret generated with rand()
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
CallBackery versions before 0.62.0 for Perl allow session cookie forgery via a signing secret generated with rand()
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.
- Record
CVE-2026-118986- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-338
- Updated
- 2026-11-06
EUVDEUVD-2026-113922
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.
- Record
EUVD-2026-113922- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-06
GitHub AdvisoriesGHSA-fr5m-676f-94fg
CallBackery versions before 0.62.0 for Perl allow session cookie forgery via a signing secret...
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.
- Record
GHSA-fr5m-676f-94fg- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-338
- Updated
- 2026-11-06
NVD
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.
- Record
CVE-2026-118986- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-338
- Updated
- 2026-11-06
History
| Recorded | Changed | Sources |
|---|---|---|
| facts, severity | CVE List | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-118986 is a high vulnerability (CVSS 7.5), published October 30, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 24th percentile. No source names a fixed version.