CVE-2026-83557

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.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• 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

0.71% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 53.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-08.

Red Hat severity

Moderate. 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.

Published

2026-09-01 14:57Z1 MO AGO

Last updated

2026-09-01 17:46Z1 MO AGO

Reserved

2026-08-31

Assigning CNA

HeroDevs

Record state

PUBLISHED

Severity

Medium (CVSS 5.6)

CNA CVSS vector

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

Weaknesses

• CWE-502Deserialization of Untrusted DataBase
• CWE-915Improperly Controlled Modification of Dynamically-Determined Object AttributesBase
• CWE-1287Improper Validation of Specified Type of InputBase

Data version

5.2

Document digest

0697db6bf4d9196e29293a11ef06fc467967318d96d9bd58cc70fda9404a7989

• github.comGHSA-gx83-3vf8-gh7jhttps://github.com/FasterXML/jackson-databind/security/advisories/GHSA-gx83-3vf8-gh7jthird-party-advisory
• github.comFasterXML/jackson-databind#6155https://github.com/FasterXML/jackson-databind/pull/6155patchissue-tracking
• github.comFasterXML/jackson-databind#6156https://github.com/FasterXML/jackson-databind/issues/6156issue-tracking
• github.comFix commit (2.x line, forward-merged to 2.21, 2.22 and the 3.x branches)https://github.com/FasterXML/jackson-databind/commit/eb3b7fc0f9c0d27f471550ac3316b17d1987388fpatch