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Vulnerability Database · Debian · Package report

expat: vulnerability history, versions and safety

expat is a package in the Debian ecosystem. Vulert records 6 vulnerabilities for it across 33 releases, from Jan 2014 to Oct 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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6 vulnerabilities recorded U6
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3 with no fix published

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

See the unfixed vulnerabilities →
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3 in the last 12 months

Most recent disclosure 05 Oct 2026.

See the disclosure history →
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0 malicious-package vulnerabilities

No published version shipped hostile code.

See all expat vulnerabilities

Vulert verdict on expat i

Updated on 23 Oct 2026

Careful: 3 of the 6 vulnerabilities Vulert records for this package have no fix yet. Plan around those, or apply the workaround listed for each. The rest have a fixed version to move to.

Long-term outlook: usable, but needs attention 6 vulnerabilities on record across 12 years, 3 in the last year.

What to do: Plan around the 3 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 6 over 12 years · 3 in the last year i
  • Latest disclosure 05 Oct 2026 i
  • Highest CVSS 7.5 i
  • With no published fix 3 i

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01 Versions

Which versions are affected

Every version Vulert holds for expat, 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 33 of 33 versions on record. Severity counts are the vulnerabilities recorded against that exact release.

02 Disclosure history

How often vulnerabilities are recorded

  • 2014 1
  • 2024 1
  • 2025 1
  • 2026 3

Counted by the year Vulert recorded each vulnerability — the same date the table below shows as disclosed. 3 of the 6 were recorded in the last 12 months.

03 Vulnerabilities

Recorded vulnerabilities for expat

The 5 most severe of 6 vulnerabilities recorded for this package

Search all 6 in the database →
Vulnerability Severity Fixed version ↓ Disclosed ↓
Expat Package Vulnerability: Malformed UTF-16 Sequence Acceptance 7.5 high No fix published 19 Sep 2026
Integer Overflow Vulnerability in Expat Package Leading to Heap Buffer Overflow 5.9 medium No fix published 29 Sep 2026
Critical Security Update for Expat Package - DSA-5770-1 N/A unrated 2.5.0-1+deb12u1 17 Sep 2024
Denial of Service and Data Exposure Vulnerability in Expat Package N/A unrated 2.4.1-2 21 Jan 2014
Stack Overflow Vulnerability in Expat Package: Denial of Service Risk N/A unrated 2.5.0-1+deb12u2 14 Mar 2025

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 expat

Is expat safe to use?

Vulert records 6 vulnerabilities for expat in Debian: 0 critical, 0 high, 0 medium and 0 low, plus 6 not yet rated. 3 of them have no published fix yet, so those are the ones to avoid or mitigate.

How many vulnerabilities does expat have?

6 vulnerabilities are recorded for expat in the Debian ecosystem: 0 critical, 0 high, 0 medium and 0 low, plus 6 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 expat vulnerabilities disclosed?

3 vulnerabilities were recorded for expat in the last 12 months, and the oldest entry in this database dates to 21 Jan 2014. 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 expat 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 expat for upcoming vulnerabilities?

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