jackson-core · NumberInput.looksLikeValidNumber()
Affects jackson-coreSource GCVE Database
Not known to be exploited · CVSS 7.5 High.
Data as of 9 Nov 2026, 13:54 UTC
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 22 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10jackson-corepkg:deb/ubuntu/jackson-core?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 20.04 LTSjackson-corepkg:deb/ubuntu/jackson-core?arch=source&distro=focalOther threats | Affected
| Fixed in– |
Ubuntu 18.04 LTSjackson-corepkg:deb/ubuntu/jackson-core?arch=source&distro=bionicOther threats | Affected
| Fixed in– |
Ubuntu 16.04 LTSjackson-corepkg:deb/ubuntu/jackson-core?arch=source&distro=xenialOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available that replaces the problematic regular expressions with a single-pass scan. Users should upgrade to a jackson-core version that includes this fix. Since the vulnerability exists only in versions 2.17.0 and later, upgrading to a fixed version beyond 2.17.2 or the vendor's patched release is recommended. No other mitigations are indicated.
Description
A regular expression inefficiency in the NumberInput.looksLikeValidNumber() method of FasterXML jackson-core versions since 2.17.0 causes quadratic time complexity when validating certain stringified numbers. This can lead to excessive CPU consumption and denial of service when deserializing large JSON numeric strings. Versions prior to 2.17.0 are not affected. The issue is fixed by replacing the problematic regex with a single-pass scan.
References
- ubuntu.com/security/CVE-2026-89407 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89407 (opens in a new tab)
- github.com/FasterXML/jackson-core/security/advisories/GHSA-p6pp-m3f8-5c89 (opens in a new tab)
- github.com/FasterXML/jackson-core/issues/1649 (opens in a new tab)
- github.com/FasterXML/jackson-core/pull/1650 (opens in a new tab)
- github.com/FasterXML/jackson-core/pull/1701 (opens in a new tab)