CVE-2026-25526: JinJava is a Java-based template engine based on django template syntax, adapted to render jinja templates

Q: How do I fix CVE-2026-25526?

jinjava: upgrade to 2.7.6, 2.8.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-25526 being exploited?

CVE-2026-25526 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-2026-25526 affect?

CVE-2026-25526 affects jinjava. Severity is critical (CVSS 9.8). JinJava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Prior to versions 2.7.6 and 2.8.3, JinJava is vulnerable to arbitrary Java execution via bypass through ForTag. This allows arbitrar

Q: How urgent is CVE-2026-25526?

Priority 58/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-25526 is a critical-severity flaw (CVSS 9.8) affecting jinjava. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

JinJava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Prior to versions 2.7.6 and 2.8.3, JinJava is vulnerable to arbitrary Java execution via bypass through ForTag. This allows arbitrary Java class instantiation and file access bypassing built-in sandbox restrictions. This issue has been patched in versions 2.7.6 and 2.8.3.

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-1336
Published	2026-02-04
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: hubspot

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-04 22:15 UTCPublished CVE record published
2026-06-17 10:24 UTCUpdated Record last modified

hubspot jinjava UPGRADE

Affected: < 2.7.6 · >= 2.8.0 and < 2.8.3

Fixed in: 2.7.6, 2.8.3

Safe to downgrade to: a release before 2.8.0

1. Check installed version

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

2. UPGRADE to 2.7.6 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jinjava

Note

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

3. If no update is available yet, DOWNGRADE to a release before 2.8.0 (Debian / Ubuntu)

apt-cache madison jinjava sudo apt install jinjava=<VERSION_BEFORE_2.8.0> sudo apt-mark hold jinjava

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jinjava sudo dnf downgrade jinjava-<VERSION_BEFORE_2.8.0> sudo dnf versionlock add jinjava

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Maven · com.hubspot.jinjava:jinjava · FIXED · 2.8.3 · vulnerable: >= 2.8.0, < 2.8.3 · source

Set com.hubspot.jinjava:jinjava to 2.8.3 or later in pom.xml or build.gradle, then rebuild and redeploy.

Fedora 46 · php-pecl-yac · FIXED · 3.0.2-1.fc46 · FEDORA-2026-0322a78385 · source

sudo dnf upgrade --advisory=FEDORA-2026-0322a78385

Fedora ELN · openldap · FIXED · 2.6.16-1.eln159 · FEDORA-2026-4b30c86326 · source

sudo dnf upgrade --advisory=FEDORA-2026-4b30c86326

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: av4nth1ka/jinjava-cve-2026-25526-poc (3 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-2026-25526?

jinjava: upgrade to 2.7.6, 2.8.3. Exact commands for each OS are on this page.

Is CVE-2026-25526 being exploited?

CVE-2026-25526 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-2026-25526 affect?

CVE-2026-25526 affects jinjava. Severity is critical (CVSS 9.8). JinJava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Prior to versions 2.7.6 and 2.8.3, JinJava is vulnerable to arbitrary Java execution via bypass through ForTag. This allows arbitrar

How urgent is CVE-2026-25526?

Priority 58/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities · Django vulnerabilities

References

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