CVE-2026-53435: In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for attackers to have Jenkins deserializ

Q: How do I fix CVE-2026-53435?

jenkins: upgrade to 2.555.3, 2.568. Exact commands for each OS are on this page.

Q: Is CVE-2026-53435 being exploited?

CVE-2026-53435 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-2026-53435 affect?

CVE-2026-53435 affects jenkins. Severity is high (CVSS 8.8). In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for attackers to have Jenkins deserialize arbitrary types defined in Jenkins core or plugins from an attacker-controlled `config.xml` submission in a way that allows them

Q: How urgent is CVE-2026-53435?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited

This week

HIGH 8.8UPGRADE

CVE-2026-53435 is a high-severity flaw (CVSS 8.8) affecting jenkins. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for attackers to have Jenkins deserialize arbitrary types defined in Jenkins core or plugins from an attacker-controlled `config.xml` submission in a way that allows them to handle HTTP requests afterwards. This can be used to impersonate any user and send HTTP requests on their behalf, up to and including use of the Script Console to run arbitrary code, or to read arbitrary fi

Why this priority

High severity
EPSS top 1%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	53.1% (top 1%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-06-10
Last modified	2026-10-26

Publisher (CNA): Jenkins Project · Vendor: jenkins

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

Am I affected?

Timeline

2026-06-10 14:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

jenkins jenkins UPGRADE

Affected: < 2.555.3 · < 2.568

Fixed in: 2.555.3, 2.568

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.555.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jenkins

Note

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

Exact fixes by distribution

Maven · org.jenkins-ci.main:jenkins-core · FIXED · 2.555.3 · vulnerable: < 2.555.3 · source

Set org.jenkins-ci.main:jenkins-core to 2.555.3 or later in pom.xml or build.gradle, then rebuild and redeploy.

Fedora 46 · selenium-manager · FIXED · 4.45.0-3.fc46 · FEDORA-2026-0af4ceb64a · source

sudo dnf upgrade --advisory=FEDORA-2026-0af4ceb64a

Fedora ELN · libdnf · FIXED · 0.76.0-2.eln159 · FEDORA-2026-dbd263e9d4 · source

sudo dnf upgrade --advisory=FEDORA-2026-dbd263e9d4

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: AmesianX/CVE-2026-53435 (11 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-2026-53435?

jenkins: upgrade to 2.555.3, 2.568. Exact commands for each OS are on this page.

Is CVE-2026-53435 being exploited?

CVE-2026-53435 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-2026-53435 affect?

CVE-2026-53435 affects jenkins. Severity is high (CVSS 8.8). In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for attackers to have Jenkins deserialize arbitrary types defined in Jenkins core or plugins from an attacker-controlled `config.xml` submission in a way that allows them

How urgent is CVE-2026-53435?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited

Software pages

Jenkins vulnerabilities

Related CVEs

CVE-2026-53437 MEDIUM 4.3 UPGRADE Jenkins 2.567 and earlier, LTS 2.555.2 and earlier improperly determines that a redirect URL after login is le
CVE-2026-53442 MEDIUM 5.3 UPGRADE Jenkins 2.567 and earlier, LTS 2.555.2 and earlier does not encrypt secrets from POST config.xml submissions b
CVE-2026-53441 MEDIUM 5.4 UPGRADE Jenkins 2.483 through 2.567 (both inclusive), LTS 2.492.1 through 2.555.2 (both inclusive) does not escape the
CVE-2026-53436 MEDIUM 4.3 UPGRADE Jenkins 2.567 and earlier, LTS 2.555.2 and earlier improperly determines that a redirect URL after login is le
CVE-2026-53438 MEDIUM 4.3 UPGRADE A missing permission check in Jenkins 2.567 and earlier, LTS 2.555.2 and earlier allows attackers with Item/Ca

References

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