CASCACascade Atlas

Evidence dossier

CVE-2026-53435

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…

CVE Program source reports CVSS 3.1 8.8. EPSS estimates 44.3% exploit likelihood as of Aug 27, 2026.

35.3–85.6Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

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 files from the Jenkins controller.

State
PUBLISHED
Published
Jun 10, 2026
Updated
Aug 27, 2026
Evidence coverage
45%

Evidence chronology

What was known when

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  1. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    jenkins

    Record text: 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 files from the Jenkins controller.

    Inspect raw assertion
    Field
    container
    Value
    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 files from the Jenkins controller.
    Original evidence ↗
  3. Source dateSource date omittedFirst observed by CASCA
    redhat-SADP

    Record text: jenkins: Jenkins: Arbitrary code execution via deserialization of attacker-controlled configuration

    Inspect raw assertion
    Field
    container
    Value
    jenkins: Jenkins: Arbitrary code execution via deserialization of attacker-controlled configuration
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 44.28% probability · 98.66th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.442830000000; percentile 0.986600000000
    Original evidence ↗
ExploitationCISA KEV: unlisted at 27 Aug 2026 18:09 UTC

The item is not listed in the bounded source as of the stated cutoff; this does not establish safety or absence outside that source.

Exploit likelihood44.28%

FIRST EPSS · score date Aug 27, 2026 · 98.7th percentile · first observed Aug 27, 2026

SeverityCVSS 8.8

CVE Program source · CVSS 3.1 · first observed Aug 26, 2026 · same-version scores align in this snapshot

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1
Exploitation statusUnlisted at snapshot cutoff

The item is not listed in the bounded source as of the stated cutoff; this does not establish safety or absence outside that source.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
Monitor bounded source
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Severity assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 2026
Resolution
None
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Aug 27, 2026
Resolution
Resolve identity

Source comparison

Who said what

CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
jenkinsOriginal assertion
Record text

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 files from the Jenkins controller.

Inspect raw assertion
Field
container
Value
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 files from the Jenkins controller.
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
redhat-SADPSource-declared origin
Record text

jenkins: Jenkins: Arbitrary code execution via deserialization of attacker-controlled configuration

Inspect raw assertion
Field
container
Value
jenkins: Jenkins: Arbitrary code execution via deserialization of attacker-controlled configuration
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

44.28% probability · 98.66th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.442830000000; percentile 0.986600000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
2Underlying assertions
1Canonical products
2Target assertions
0Constraint assertions

Grouped from 1 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

13 scope groups

jenkins · source assertedJenkins ProjectJenkinsDirect source scope
Unaffected: 2.568 to before * (maven comparison)Unaffected: 2.555.3 to before 2.555.* (maven comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "2.568", "lessThan": "*", "versionType": "maven"}, {"status": "unaffected", "version": "2.555.3", "lessThan": "2.555.*", "versionType": "maven"}]
redhat-SADP · source assertedRed HatOpenShift Developer Tools and Services 4.12Direct source scope
Unaffected: 1786628667 to before * (rpm comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "1786628667", "lessThan": "*", "versionType": "rpm"}]
redhat-SADP · source assertedRed HatOpenShift Developer Tools and Services 4.13Direct source scope
Unaffected: 1786628681 to before * (rpm comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "1786628681", "lessThan": "*", "versionType": "rpm"}]
redhat-SADP · source assertedRed HatOpenShift Developer Tools and Services 4.14Direct source scope
Unaffected: 1786533561 to before * (rpm comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "1786533561", "lessThan": "*", "versionType": "rpm"}]
redhat-SADP · source assertedRed HatOpenShift Developer Tools and Services 4.15Direct source scope
Unaffected: 1786533565 to before * (rpm comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "1786533565", "lessThan": "*", "versionType": "rpm"}]
redhat-SADP · source assertedRed HatOpenShift Developer Tools and Services 4.16Direct source scope
Unaffected: 1787125166 to before * (rpm comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "1787125166", "lessThan": "*", "versionType": "rpm"}]
redhat-SADP · source assertedRed HatOpenShift Developer Tools and Services 4.17Direct source scope
Unaffected: 1787124635 to before * (rpm comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "1787124635", "lessThan": "*", "versionType": "rpm"}]
redhat-SADP · source assertedRed HatOpenShift Developer Tools and Services 4.18Direct source scope
Unaffected: 1787125069 to before * (rpm comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "1787125069", "lessThan": "*", "versionType": "rpm"}]
redhat-SADP · source assertedRed HatOpenShift Developer Tools and Services 4.19Direct source scope
Unaffected: 1787124632 to before * (rpm comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "1787124632", "lessThan": "*", "versionType": "rpm"}]
redhat-SADP · source assertedRed HatOpenShift Developer Tools and Services 4.20Direct source scope
Unaffected: 1787124925 to before * (rpm comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "1787124925", "lessThan": "*", "versionType": "rpm"}]
redhat-SADP · source assertedRed HatOpenShift Developer Tools and Services 4.21Direct source scope
Unaffected: 1787125311 to before * (rpm comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "1787125311", "lessThan": "*", "versionType": "rpm"}]
redhat-SADP · source assertedRed HatOpenShift Developer Tools and Services 4.22Direct source scope
Unaffected: 1787124779 to before * (rpm comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "unaffected", "version": "1787124779", "lessThan": "*", "versionType": "rpm"}]
NVD CPE · APPLICATIONjenkinsjenkinsVulnerable target · 2 assertions
Any version (unconstrained) (< 2.555.3); Any version (unconstrained) (< 2.568)Canonical identity product-9a7b30e062b64dc90ffa4bc3d1b42685ee8d4f40a130934a5fbdf5e24b68b52aLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    through excluding 2.568
    Match ID
    356a970f-6576-49b6-8eba-e9770ed190a7
  2. cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    through excluding 2.555.3
    Match ID
    648b5148-fe3b-464a-8963-dcf7acef84e5

Affected-product evidence

Accepted scope and product mapping

0 canonical links · 2 source-reported links

Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
12
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
1131f02a-e98e-4437-949f-838c7b5720d952eb15ff-ff27-4846-bfda-7f7b7592a8e55d83b63a-89fe-474c-a4c1-cea97c9106708f864b39-ce6b-4bf6-8f5e-356aa4e7868798959d6e-dac5-4d1d-9075-ee0f3dfb9b0f993139b0-6240-407c-bab5-a17645e55995a056cd4c-b8d8-4fc5-94a6-3b4d78ca3e53a8687972-3d16-4e0d-ba42-227d7a8afe9fbb7e4b81-6ca5-4bb3-9d45-b0d2534d4144cfd86103-5d95-4915-b6c7-f50697b40ff3dcabcdb4-1b32-4226-afa4-67ccff9e3379f26fc788-bf82-4988-ba74-7edb7322e2d2
Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
9332f58e-4361-44c7-941e-7bef1a158677ddfabb4b-ada2-4ec0-be4a-b740b39e9b41

Assessments

CVSS by origin

8.8
CVE Program sourceCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8
CVE Program sourceCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8
CISA-ADPCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8
redhat-SADPCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Direct CVE/CNA normalized decisions

8.8Priority eligible

CISA-ADP

CVSS 3.1 · Secondary · Independent enrichment · rank 2

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Validation
Valid match
Recomputed
8.8
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1
8.8Display only

redhat-SADP

CVSS 3.1 · Secondary · Unknown origin · rank 2

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Validation
Valid match
Recomputed
8.8
Decision reason
Policy deferred
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

  • CISA KEV catalog silence leaves exploitation status unassessed.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.