01 Record

CVE-2026-91777

jackson-databind: quadratic forward-reference completion in Collection and Map deserializers

HighPUBLISHEDCNA: HeroDevs

CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

View raw JSON

02 Description

jackson-databind: quadratic forward-reference completion in Collection and Map deserializers

03 Exploitation and scoring

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.48% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 41.6% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Deferred. NVD last modified this record on 2026-09-24.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-09-23 02:21Z1 MO AGO

Last updated

2026-09-23 14:05Z1 MO AGO

Reserved

2026-09-15

Assigning CNA

HeroDevs

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE-400Uncontrolled Resource ConsumptionClass
CWE-606Unchecked Input for Loop ConditionBase

Data version

5.2

Document digest

6e79d1a6b4001f2cd782a9edf6dbf1b8ffab14fc40834b80df809c4b18a4da72

05 Affected products

VendorProductVersionsPlatforms

FasterXMLjackson-databind2.5.0 to 2.18.10, 2.19.0 to 2.21.6, 2.22.0 to 2.22.2, 3.0.0 to 3.1.6, 3.2.0 to 3.2.2—

06 References

github.comGHSA-cxp5-3px4-pw24https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-cxp5-3px4-pw24vendor-advisory
github.comFasterXML/jackson-databind#6204https://github.com/FasterXML/jackson-databind/issues/6204patch

07 Remediation

Upgrade to com.fasterxml.jackson.core:jackson-databind 2.18.11, 2.21.7 or 2.22.3, or to tools.jackson.core:jackson-databind 3.1.7 or 3.2.3. Lines 2.5.x through 2.17.x, 2.19.x, 2.20.x and 3.0.x received no fix on their own branch and are no longer maintained upstream.

08 Fixed in

AlmaLinux 9

pki-jackson-databind
Fixed in 2.21.6-1.el9_8.1

CloudLinux 9

pki-jackson-databind
Fixed in 2.21.6-1.el9_8.1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Debian 12

jackson-databind
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

jackson-databind
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

jackson-databind
Fixed in 2.18.11-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.