CVE-2026-26379: Koha versions up to 25.11 contain a Server-Side Request Forgery (SSRF) vulnerability via the Z39.50/SRU server

Q: How do I fix CVE-2026-26379?

koha: upgrade to newer than 25.11.00. Exact commands for each OS are on this page.

Q: Is CVE-2026-26379 being exploited?

CVE-2026-26379 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-2026-26379 affect?

CVE-2026-26379 affects koha. Severity is medium (CVSS 6.5). Koha versions up to 25.11 contain a Server-Side Request Forgery (SSRF) vulnerability via the Z39.50/SRU server configuration. This allows authenticated attackers to perform internal network scanning and identify running services by analyzin

Q: How urgent is CVE-2026-26379?

Priority 37/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 6.5REMOTEUPGRADE

CVE-2026-26379 is a medium-severity flaw (CVSS 6.5) affecting koha. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Koha versions up to 25.11 contain a Server-Side Request Forgery (SSRF) vulnerability via the Z39.50/SRU server configuration. This allows authenticated attackers to perform internal network scanning and identify running services by analyzing server response times.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-06-03
Last modified	2026-07-22

Publisher (CNA): MITRE · Vendor: koha

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-03 19:16 UTCPublished CVE record published
2026-07-22 20:10 UTCUpdated Record last modified

koha koha UPGRADE

Affected: <= 25.11.00

Fixed in: newer than 25.11.00

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 25.11.00 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade koha

Note

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

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-2026-26379?

koha: upgrade to newer than 25.11.00. Exact commands for each OS are on this page.

Is CVE-2026-26379 being exploited?

CVE-2026-26379 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-2026-26379 affect?

CVE-2026-26379 affects koha. Severity is medium (CVSS 6.5). Koha versions up to 25.11 contain a Server-Side Request Forgery (SSRF) vulnerability via the Z39.50/SRU server configuration. This allows authenticated attackers to perform internal network scanning and identify running services by analyzin

How urgent is CVE-2026-26379?

Priority 37/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-26378 MEDIUM 5.4 UPGRADE Cross Site Scripting vulnerability in Koha 25.11 and before allows a remote attacker to execute arbitrary code
CVE-2026-50767 MEDIUM 5.4 UPGRADE A stored cross-site scripting (XSS) vulnerability in the item type administration page of Koha Library Managem
CVE-2026-50766 MEDIUM 5.4 UPGRADE A stored cross-site scripting (XSS) vulnerability in the OPAC item detail page of Koha Library Management Syst
CVE-2026-50765 MEDIUM 6.1 UPGRADE A stored cross-site scripting (XSS) vulnerability in the patron restriction type administration page of Koha L

References

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