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Vulnerability Database · Debian · Package report

ujson: vulnerability history, versions and safety

ujson is a package in the Debian ecosystem. Vulert records 7 vulnerabilities for it across 16 releases, from Jan 2022 to Jun 2026. Each vulnerability names the versions it affects, the fixed version to move to, and a workaround where no fix has been published.

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7 vulnerabilities recorded U7
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7 with no fix published

No patched version yet — these are the ones to plan around.

See the unfixed vulnerabilities →
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4 in the last 12 months

Most recent disclosure 22 Jun 2026.

See the disclosure history →
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0 malicious-package vulnerabilities

No published version shipped hostile code.

See all ujson vulnerabilities

Vulert verdict on ujson i

Updated on 23 Oct 2026

Careful: 7 of the 7 vulnerabilities Vulert records for this package have no fix yet. Plan around those, or apply the workaround listed for each.

Long-term outlook: usable, but needs attention 7 vulnerabilities on record across 4 years, 4 in the last year.

What to do: Plan around the 7 vulnerabilities with no published fix: each lists the affected range and any workaround that reduces exposure. No fix yet: Vulert alerts you the moment one is published. Monitor it with Vulert →

  • Vulnerabilities on record 7 over 4 years · 4 in the last year i
  • Latest disclosure 22 Jun 2026 i
  • Highest CVSS 7.5 i
  • With no published fix 7 i

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01 Versions

Which versions are affected

Every version Vulert holds for ujson, newest first, with the vulnerabilities that name it. A version with a count of zero has no recorded vulnerabilities; open a version to see the vulnerabilities it is exposed to.

Newest 16 of 16 versions on record. Severity counts are the vulnerabilities recorded against that exact release.

02 Disclosure history

How often vulnerabilities are recorded

  • 2022 3
  • 2026 4

Counted by the year Vulert recorded each vulnerability — the same date the table below shows as disclosed. 4 of the 7 were recorded in the last 12 months.

03 Vulnerabilities

Recorded vulnerabilities for ujson

The 5 most severe of 7 vulnerabilities recorded for this package

Search all 7 in the database →
Vulnerability Severity Fixed version ↓ Disclosed ↓
Improper JSON Decoding in UltraJSON (ujson) Leading to Potential Data Corruption 7.5 high No fix published 05 Jul 2022
Memory Leak Vulnerability in UltraJSON (ujson) Affects Multiple Debian Versions 7.5 high No fix published 20 Mar 2026
Buffer Overflow and Infinite Loop Vulnerability in ujson Package 7.5 high No fix published 20 Mar 2026
Memory Leak Vulnerability in UltraJSON (ujson) Prior to Version 5.12.1 7.5 high No fix published 27 May 2026
Input Validation Bypass in UltraJSON (ujson) - CVE-2026-54911 6.5 medium No fix published 22 Jun 2026

Vulnerability wrong, a fix missing, or a package we should cover? Report it and we will fix the record. Report Vulnerability Provide Feedback

Updated: 23/Oct/2026 · Vulnerabilities in our DB: 524315

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Questions

About ujson

Is ujson safe to use?

Vulert records 7 vulnerabilities for ujson in Debian: 0 critical, 0 high, 0 medium and 0 low, plus 7 not yet rated. 7 of them have no published fix yet, so those are the ones to avoid or mitigate.

How many vulnerabilities does ujson have?

7 vulnerabilities are recorded for ujson in the Debian ecosystem: 0 critical, 0 high, 0 medium and 0 low, plus 7 not yet rated. The ledger on this page lists the same counts next to the date of the most recent disclosure.

How often are new ujson vulnerabilities disclosed?

4 vulnerabilities were recorded for ujson in the last 12 months, and the oldest entry in this database dates to 01 Jan 2022. Recency matters more than a lifetime total: it shows how actively new issues are being disclosed for the package you are considering.

Which versions of ujson are affected?

Each vulnerability on this page lists the affected version range and the fixed version to move to. Open the vulnerability for the version you actually run — fixes are specific to a release line, not to the package as a whole.

How do I monitor ujson for upcoming vulnerabilities?

Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the ujson version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.