Vulnerability Database · Debian · Package report
firefox-esr: vulnerability history, versions and safety
firefox-esr is a package in the Debian ecosystem. Vulert records 190 vulnerabilities for it across 120 releases, from Dec 2022 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.
No patched version yet — these are the ones to plan around.
See the unfixed vulnerabilities →No published version shipped hostile code.
Vulert verdict on firefox-esr i
Updated on 23 Oct 2026
Careful: 162 of the 190 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.
What to do: Plan around the 162 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 190 over 3 years · 167 in the last year i
- Latest disclosure 20 Oct 2026 i
- Highest CVSS 10.0 i
- With no published fix 162 i
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01 Versions
Which versions are affected
Every version Vulert holds for firefox-esr, 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 120 of 213 versions on record. Severity counts are the vulnerabilities recorded against that exact release.
02 Disclosure history
How often vulnerabilities are recorded
Counted by the year Vulert recorded each vulnerability — the same date the table below shows as disclosed. 167 of the 190 were recorded in the last 12 months.
Other ways into the data
03 Vulnerabilities
Recorded vulnerabilities for firefox-esr
| Vulnerability | Severity | Fixed version ↓ | Disclosed ↓ |
|---|---|---|---|
| Critical Sandbox Escape Vulnerability in Firefox ESR Package | 10.0 critical | No fix published | 18 Aug 2026 |
| Critical Sandbox Escape Vulnerability in Firefox ESR Package | 9.6 critical | No fix published | 29 Sep 2026 |
| Critical Sandbox Escape Vulnerability in Firefox ESR Packages | 9.6 critical | No fix published | 29 Sep 2026 |
| Critical Sandbox Escape Vulnerability in Firefox ESR Packages | 9.6 critical | No fix published | 29 Sep 2026 |
| Critical Sandbox Escape Vulnerability in Firefox ESR | 9.6 critical | No fix published | 29 Sep 2026 |
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Updated: 23/Oct/2026 · Vulnerabilities in our DB: 524315
