`CVE-2026-91777`

Severity	7.5 High CVSS 3.1
Fixed in	`2.21.7`, `2.18.11`, `2.22.3`
Weakness	Uncontrolled resource consumption (CWE-400)
Published	23 Sep 2026
Updated	24 Sep 2026

Published 52 days ago. NVD often adds the list of affected products days or weeks after a CVE is published, and the other sources we check lag too. The scope and status here may change.

Description

Forward-reference completion for @JsonIdentityInfo object IDs in FasterXML jackson-databind performs a linear scan of the pending-reference accumulator for every resolved ID. The affected paths are CollectionDeserializer.CollectionReferringAccumulator.resolveForwardReference() and the equivalent implementation in MapDeserializer. When a document first creates N unresolved object-ID references in an identity-enabled collection or map and then defines those same IDs in reverse order, completion performs on the order of N * (N + 1) / 2 identity comparisons, so a shallow document whose size grows linearly causes quadratic CPU work during deserialization. The reporter instrumented equals() calls on the ID class and measured exactly 2,003,000 comparisons at N = 2,000, against zero comparisons in the pending-reference lookup path for an equally sized control in which every reference was already resolved. The input requires no deep nesting and no syntactically unusual JSON. Exploitation requires an application that deserializes attacker-influenced JSON into an identity-enabled collection or map. The fix replaces the repeated linear lookup with a keyed pending-reference structure.

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

CISA KEV not listed
VulnCheck KEV not listed
CISA Vulnrichment exploitation: poc CISA recorded that an exploit has been demonstrated. Automatable: yes, technical impact: partial.
Indexed PoC none indexed
EPSS 0.49% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: FasterXML/jackson-databind #6204.

Protection none
Action unverified
Review automated Upstream data
Record active

Decided by	Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding	This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix	https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-cxp5-3px4-pw24 : the maintainers' own security advisory: names the version that fixes it, so the fix is the difference between two releases

Decided by

Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

Finding

This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Candidate fix

https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-cxp5-3px4-pw24 : the maintainers' own security advisory: names the version that fixes it, so the fix is the difference between two releases

Affected software and releases

Oracle advisories

Advisory	Type	Quarter	Products Oracle names in its risk matrix
Oracle Critical Patch Update October 2026 ↗	CPU	2026-Q4	Oracle Communications / Configuration (jackson-databind) (25.2.200, 26.1.200) Oracle Construction and Engineering / Platform (jackson-databind) (21.12.0-21.12.17, 22.12.0-22.12.15, 23.12.0-23.12.16, 24.12.0-24.12.16, 25.12.0-25.12.9) Oracle Fusion Middleware / NextGen Installer (jackson-databind) (12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 14.1.2.1.0, 15.1.1.0.0)

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update October 2026 ↗

CPU

2026-Q4

Oracle Communications / Configuration (jackson-databind) (25.2.200, 26.1.200)
Oracle Construction and Engineering / Platform (jackson-databind) (21.12.0-21.12.17, 22.12.0-22.12.15, 23.12.0-23.12.16, 24.12.0-24.12.16, 25.12.0-25.12.9)
Oracle Fusion Middleware / NextGen Installer (jackson-databind) (12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 14.1.2.1.0, 15.1.1.0.0)

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Communications	Configuration (jackson-databind)	25.2.200, 26.1.200	25.2.200 · 26.1.200
Oracle Construction and Engineering	Platform (jackson-databind)	21.12.0-21.12.17, 22.12.0-22.12.15, 23.12.0-23.12.16, 24.12.0-24.12.16, 25.12.0-25.12.9
Oracle Fusion Middleware	NextGen Installer (jackson-databind)	12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 14.1.2.1.0, 15.1.1.0.0	12.2.1.4.0 · 14.1.1.0.0 · 14.1.2.0.0 · 14.1.2.1.0 · 15.1.1.0.0

Family

Component

Versions, as Oracle lists them

Read as

Oracle Communications

Configuration (jackson-databind)

25.2.200, 26.1.200

25.2.200 · 26.1.200

Oracle Construction and Engineering

Platform (jackson-databind)

21.12.0-21.12.17, 22.12.0-22.12.15, 23.12.0-23.12.16, 24.12.0-24.12.16, 25.12.0-25.12.9

Oracle Fusion Middleware

NextGen Installer (jackson-databind)

12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 14.1.2.1.0, 15.1.1.0.0

12.2.1.4.0 · 14.1.1.0.0 · 14.1.2.0.0 · 14.1.2.1.0 · 15.1.1.0.0

Maven packages

Affected and fixed versions, from OSV.dev

Package Introduced Fixed Last affected

com.fasterxml.jackson.core:jackson-databind 2.19.0 2.21.7 unbounded

tools.jackson.core:jackson-databind 3.0.0 3.1.7 unbounded

tools.jackson.core:jackson-databind 3.2.0 3.2.3 unbounded

com.fasterxml.jackson.core:jackson-databind 2.5.0 2.18.11 unbounded

com.fasterxml.jackson.core:jackson-databind 2.22.0 2.22.3 unbounded

Package	Introduced	Fixed	Last affected
`com.fasterxml.jackson.core:jackson-databind`	2.19.0	`2.21.7`	unbounded
`tools.jackson.core:jackson-databind`	3.0.0	`3.1.7`	unbounded
`tools.jackson.core:jackson-databind`	3.2.0	`3.2.3`	unbounded
`com.fasterxml.jackson.core:jackson-databind`	2.5.0	`2.18.11`	unbounded
`com.fasterxml.jackson.core:jackson-databind`	2.22.0	`2.22.3`	unbounded

Products and versions

2 products, 5 version entries

Source	Vendor	Product	Scheme	Affected versions
osv	com.fasterxml.jackson.core	jackson-databind	generic	≥ 2.5.0 and ＜ 2.18.11 · ≥ 2.19.0 and ＜ 2.21.7 · ≥ 2.22.0 and ＜ 2.22.3
osv	tools.jackson.core	jackson-databind	generic	≥ 3.0.0 and ＜ 3.1.7 · ≥ 3.2.0 and ＜ 3.2.3

Source

Vendor

Product

Scheme

Affected versions

osv

com.fasterxml.jackson.core

jackson-databind

generic

≥ 2.5.0 and ＜ 2.18.11 · ≥ 2.19.0 and ＜ 2.21.7 · ≥ 2.22.0 and ＜ 2.22.3

osv

tools.jackson.core

jackson-databind

generic

≥ 3.0.0 and ＜ 3.1.7 · ≥ 3.2.0 and ＜ 3.2.3

References

URL	Tags
https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-cxp5-3px4-pw24	advisory
https://github.com/FasterXML/jackson-databind/issues/6204	WEB
https://github.com/FasterXML/jackson-databind/pull/6204	WEB
https://github.com/FasterXML/jackson-databind/commit/37ad9b81712cbb9fb62c2d2c1813593252a24b67	WEB
https://github.com/FasterXML/jackson-databind	PACKAGE
https://github.com/FasterXML/jackson-databind/releases/tag/jackson-databind-2.18.11	WEB
https://github.com/FasterXML/jackson-databind/releases/tag/jackson-databind-2.21.7	WEB
https://github.com/FasterXML/jackson-databind/releases/tag/jackson-databind-2.22.3	WEB
https://github.com/FasterXML/jackson-databind/releases/tag/jackson-databind-3.1.7	WEB
https://github.com/FasterXML/jackson-databind/releases/tag/jackson-databind-3.2.3	WEB

URL

Timeline

Published	2026-09-23	By the CVE Program.
NVD record modified	2026-09-24	NVD's own last-modified date for this record.

Published

2026-09-23

By the CVE Program.

NVD record modified

2026-09-24

NVD's own last-modified date for this record.

How VRT decided (17 of 24 rules ran)

17 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification no match Manual classification of this CVE in the legacy dataset

6 non-java-upstream no match A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component no match The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side no match Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven matched In scope Maven packages: com.fasterxml.jackson.core:jackson-databind, tools.jackson.core:jackson-databind

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint matched Mitigation candidate References include candidate fix URL (advisory tier): https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-cxp5-3px4-pw24

18 open-source-maven skipped The affected package being open source on Maven, so the fix can be read

19 poc-derivable skipped An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit skipped Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match withheld The description names deserialization, but in an unsupported deserialization library; not promoted on the description alone.

22 exploited-no-fix-or-poc skipped Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold no match Severity is HIGH — only MEDIUM/LOW are deprioritized

24 no-exploit-published decided it matched No exploit published No exploit code has been published, and an upstream fix path does exist, so the remediation half of the candidacy still holds.

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