Description
Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids.
Apache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator returns a SHA-256 hash of the built-in rand() function, the epoch time, and the PID, that is hashed again. These are predictable, low-entropy sources. Predicable session ids could allow an attacker to gain access to systems.
Note that version 1.3.19 has a fallback without warning to use insecure session generation method if the call to Crypt::URandom::urandom fails. However, this is unlikely as Crypt::URandom is a hardcoded requirement of the module.
This issue is similar to CVE-2025-40931 for Apache::Session::Generate::MD5.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GUIMARD | Apache::Session::Generate::SHA256 | < 1.3.19 | 1.3.19 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libapache-session-browseable-perl | 1.3.19-1 | — |
| Debian 13 | libapache-session-browseable-perl | 1.3.16-1+deb13u1 | — |
| Debian 12 | libapache-session-browseable-perl | 1.3.11-3+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libapache-session-browseable-perl | No fix yet | — |
| Ubuntu 26.04 LTS | libapache-session-browseable-perl | No fix yet | — |
| Ubuntu 25.10 | libapache-session-browseable-perl | No fix yet | — |
| Ubuntu 24.04 LTS | libapache-session-browseable-perl | No fix yet | — |
| Ubuntu 22.04 LTS | libapache-session-browseable-perl | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libapache-session-browseable-perl | No fix yet | — |
| Ubuntu 18.04 LTS | libapache-session-browseable-perl | No fix yet | — |
| Ubuntu 16.04 LTS | libapache-session-browseable-perl | No fix yet | — |
References
- https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/changes release-notes
- https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/diff/GUIMARD/Apache-Session-Browseable-1.3.18#lib/Apache/Session/Generate/SHA256.pm
- https://github.com/LemonLDAPNG/Apache-Session-Browseable/commit/cc915cbbd266776eec3dd8bf4748b15fa827dbd0.patch patch
- https://www.cve.org/CVERecord?id=CVE-2025-40931 related
- https://www.cve.org/CVERecord?id=CVE-2025-40932 related