CVE-2019-9796

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

A use-after-free vulnerability can occur when the SMIL animation controller incorrectly registers with the refresh driver twice when only a single registration is expected. When a registration is later freed with the removal of the animation controller element, the refresh driver incorrectly leaves a dangling pointer to the driver's observer array. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
79.1%
KEV
Not listed

Published

April 26, 2019

Last Modified

November 25, 2025

Advisory Details (6)

Auto-updated Jul 6, 2026
Patch available. Sources: redhat.
generic

Security vulnerabilities fixed in Firefox 66 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-07/
generic

1531277 - (CVE-2019-9796) heap-use-after-free in nsRefreshDriver::Tick (mozilla::SMILAnimationController)

https://bugzilla.mozilla.org/show_bug.cgi?id=1531277
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2019:1144
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2019:0966
generic

Security vulnerabilities fixed in Thunderbird 60.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-11/
generic

Security vulnerabilities fixed in Firefox ESR 60.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-08/

Vendor Advisories for CVE-2019-9796(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(9)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-testsuite (66.0+build3-0ubuntu0.18.10.1) @ cosmic2026-05-27ubuntu
ubuntuxul-ext-lightning (1:60.6.1+build2-0ubuntu0.16.04.1) @ xenial2026-05-27ubuntu
ubuntufirefox-testsuite (66.0.1+build1-0ubuntu0.14.04.1) @ trusty2026-05-27ubuntu
redhatthunderbird-0:60.6.1-1.el82019-05-13redhat
redhatfirefox-0:60.6.1-1.el82019-05-07redhat
redhatthunderbird-0:60.6.1-1.el7_62019-03-28redhat
redhatthunderbird-0:60.6.1-1.el6_102019-03-28redhat
redhatfirefox-0:60.6.0-3.el7_62019-03-20redhat
redhatfirefox-0:60.6.0-3.el6_102019-03-20redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 13× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:30 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
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  5. 2026-07-20 17:04 UTCEPSS rescore
  6. 2026-07-20 17:04 UTCOSV refresh
  7. 2026-07-19 14:28 UTCEPSS rescore
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  1. 2026-07-05 02:27 UTCEPSS rescore
  2. 2026-07-04 06:28 UTCEPSS rescore
  3. 2026-07-03 12:26 UTCOSV refresh
  4. 2026-07-01 15:03 UTCEPSS rescore
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  6. 2026-06-30 23:20 UTCEPSS rescore
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  8. 2026-06-29 14:04 UTCEPSS rescore
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  24. 2026-06-18 17:50 UTCEPSS rescore
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  27. 2026-06-16 17:50 UTCEPSS rescore
  28. 2026-06-15 17:46 UTCEPSS rescore
  29. 2026-06-15 02:43 UTCOSV refresh
  30. 2026-06-14 23:15 UTCEPSS rescore
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  32. 2026-06-13 22:58 UTCEPSS rescore
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  39. 2026-06-08 14:15 UTCEPSS rescore
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  44. 2026-06-06 13:45 UTCEPSS rescore
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  46. 2026-06-05 22:45 UTCEPSS rescore
  47. 2026-06-05 06:08 UTCEPSS rescore
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  50. 2026-06-02 20:11 UTCEPSS rescore
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  52. 2026-06-01 13:50 UTCEPSS rescore
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  54. 2026-05-31 22:29 UTCEPSS rescore
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  58. 2026-05-29 13:42 UTCEPSS rescore
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  60. 2026-05-28 13:43 UTCEPSS rescore
  61. 2026-05-27 20:05 UTCEG score recompute
  62. 2026-05-27 20:05 UTCVendor advisory
  63. 2026-05-27 20:05 UTCGHSA enrichment
  64. 2026-05-27 13:39 UTCEPSS rescore
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  70. 2026-05-24 16:47 UTCEPSS rescore

Frequently asked(5)

What is CVE-2019-9796?
CVE-2019-9796 is a critical vulnerability published on April 26, 2019. A use-after-free vulnerability can occur when the SMIL animation controller incorrectly registers with the refresh driver twice when only a single registration is expected. When a registration is later freed with the removal of the animation controller element, the refresh driver incorrectly leaves…
When was CVE-2019-9796 disclosed?
CVE-2019-9796 was first published in the National Vulnerability Database on April 26, 2019, with the most recent update on November 25, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-9796 actively exploited?
CVE-2019-9796 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 79.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-9796?
CVE-2019-9796 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-9796?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-9796, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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