HTTP::Session versions before 0.54 for Perl allow memcached command injection via unfiltered session ids in HTTP::Session::Store::CHI

published 2026-11-01 7 d ago modified 2026-11-06 2 d ago also EUVD-2026-114833

cvss: —; not scored
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits: 0; none known

HTTP::Session versions before 0.54 for Perl allow memcached command injection via unfiltered session ids in HTTP::Session::Store::CHI.

The session id from the client's cookie reaches the CHI cache unchanged. The sibling HTTP::Session::Store::Memcached rejects ids that contain control characters, but the CHI store has no such check, and CHI does not escape keys for its memcached drivers.

With a memcached driver, a CR and LF in the session id end the cache command early, and the server reads the bytes after them as further commands.

Patch / fix

links 1

github.com/tokuhirom/http-session@58288cb commit

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 2 d ago (2026-11-06)

Exploit prediction

0.93% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).

Classification

Weakness

CWE-93 Improper Neutralization of CRLF Sequences

References

Sources

CVE List CVE-2026-13575
NVD CVE-2026-13575

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary