CVE-2026-49268: A remote attacker can inject LDAP special characters into the Distinguished Name (DN) construction in DefaultL

Q: How do I fix CVE-2026-49268?

shiro: upgrade to 2.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-49268 being exploited?

CVE-2026-49268 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-49268 affect?

CVE-2026-49268 affects shiro. Severity is critical (CVSS 9.1). A remote attacker can inject LDAP special characters into the Distinguished Name (DN) construction in DefaultLdapRealm class. User-supplied username input is directly concatenated into the LDAP DN template without any escaping of RFC 2253 s

Q: How urgent is CVE-2026-49268?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

This month

CRITICAL 9.1REMOTEWATCHLISTUPGRADE

CVE-2026-49268 is a critical-severity flaw (CVSS 9.1) affecting shiro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A remote attacker can inject LDAP special characters into the Distinguished Name (DN) construction in DefaultLdapRealm class. User-supplied username input is directly concatenated into the LDAP DN template without any escaping of RFC 2253 special characters. This allows an attacker to manipulate the DN structure used for LDAP bind authentication, potentially bypassing authentication or impersonating other users. This issue affects all Apache Shi

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-90
Published	2026-06-17
Last modified	2026-10-26

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-17 14:17 UTCPublished CVE record published
2026-10-26 00:10 UTCUpdated Record last modified

apache shiro UPGRADE

Affected: < 2.2.1 · 3.0.0 alpha1

Fixed in: 2.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy shiro || rpm -q shiro || shiro --version

2. UPGRADE to 2.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade shiro

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade shiro

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Maven · org.apache.shiro:shiro-core · FIXED · 2.2.1 · vulnerable: < 2.2.1 · source

Set org.apache.shiro:shiro-core to 2.2.1 or later in pom.xml or build.gradle, then rebuild and redeploy.

Fedora 46 · rust-opendal-core · FIXED · 0.59.1-2.fc46 · FEDORA-2026-4607543819 · source

sudo dnf upgrade --advisory=FEDORA-2026-4607543819

Fedora ELN · velocitty · FIXED · 1.0.3-2.eln159 · FEDORA-2026-edae8cd295 · source

sudo dnf upgrade --advisory=FEDORA-2026-edae8cd295

Debian 12 · shiro · NO FIX YET

Debian 13 · shiro · NO FIX YET

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: sassoftware/shiro (2 stars)
GitHub PoC: xiaoqiMikko/shiro-check (0 stars)

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-49268?

shiro: upgrade to 2.2.1. Exact commands for each OS are on this page.

Is CVE-2026-49268 being exploited?

CVE-2026-49268 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-49268 affect?

CVE-2026-49268 affects shiro. Severity is critical (CVSS 9.1). A remote attacker can inject LDAP special characters into the Distinguished Name (DN) construction in DefaultLdapRealm class. User-supplied username input is directly concatenated into the LDAP DN template without any escaping of RFC 2253 s

How urgent is CVE-2026-49268?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

References

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