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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.1%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation2% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.1%
EPSS %ILE
80th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

April 26, 2019

Last Modified

November 25, 2025

Advisory Details (6)

Auto-updated Oct 1, 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 / EcosystemFix (by version range) / 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.

Affected Packages

(12 across 6 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.6.0esr-1: fixed in 60.6.0esr-1
—
thunderbird—
  • every version up to 1:60.6.1-1: fixed in 1:60.6.1-1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.6.0esr-1: fixed in 60.6.0esr-1
—
thunderbird—
  • every version up to 1:60.6.1-1: fixed in 1:60.6.1-1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.6.0esr-1: fixed in 60.6.0esr-1
—
thunderbird—
  • every version up to 1:60.6.1-1: fixed in 1:60.6.1-1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.6.0esr-1: fixed in 60.6.0esr-1
—
thunderbird—
  • every version up to 1:60.6.1-1: fixed in 1:60.6.1-1
—
Debian:8(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr45.0.1esr-1 ... 60.5.1esr-1~deb9u1 (128 versions)
  • every version up to 60.6.0esr-1~deb8u1: fixed in 60.6.0esr-1~deb8u1
—
thunderbird1.5-4 ... 1:60.5.1-1~deb9u1 (71 versions)
  • every version up to 1:60.6.1-1~deb8u1: fixed in 1:60.6.1-1~deb8u1
—
Debian:9(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr45.9.0esr-1 ... 60.6.0esr-1~deb8u1 (91 versions)
  • every version up to 60.6.0esr-1~deb9u1: fixed in 60.6.0esr-1~deb9u1
—
thunderbird1.5-4 ... 1:60.6.1-1~deb8u1 (72 versions)
  • every version up to 1:60.6.1-1~deb9u1: fixed in 1:60.6.1-1~deb9u1
—

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 5× in last 7d / 26× 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.

Showing the most recent 100 of 162 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
  4. 2026-09-30 14:59 UTCEPSS rescore
  5. 2026-09-30 10:30 UTCEG score recompute
  6. 2026-09-28 08:02 UTCOSV refresh
  7. 2026-09-27 13:40 UTCEPSS rescore
  8. 2026-09-26 15:54 UTCEPSS rescore
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  10. 2026-09-24 13:59 UTCEPSS rescore
  11. 2026-09-22 14:43 UTCEPSS rescore
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  20. 2026-09-13 16:42 UTCEPSS rescore
  21. 2026-09-12 14:56 UTCEPSS rescore
  22. 2026-09-11 14:48 UTCEPSS rescore
  23. 2026-09-11 09:32 UTCEPSS rescore
  24. 2026-09-08 12:04 UTCOSV refresh
  25. 2026-09-07 15:57 UTCEPSS rescore
Show 75 more
  1. 2026-09-06 13:44 UTCEPSS rescore
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  3. 2026-09-04 13:56 UTCEPSS rescore
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  5. 2026-09-02 14:08 UTCEPSS rescore
  6. 2026-09-01 03:32 UTCEPSS rescore
  7. 2026-08-30 19:14 UTCEPSS rescore
  8. 2026-08-30 01:18 UTCEPSS rescore
  9. 2026-08-28 21:37 UTCEPSS rescore
  10. 2026-08-27 14:21 UTCEPSS rescore
  11. 2026-08-26 14:42 UTCEPSS rescore
  12. 2026-08-25 13:45 UTCEPSS rescore
  13. 2026-08-21 22:44 UTCOSV refresh
  14. 2026-08-20 22:51 UTCEPSS rescore
  15. 2026-08-19 17:00 UTCEPSS rescore
  16. 2026-08-18 13:44 UTCEPSS rescore
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  21. 2026-08-13 21:57 UTCEPSS rescore
  22. 2026-08-12 13:47 UTCEPSS rescore
  23. 2026-08-09 13:43 UTCEPSS rescore
  24. 2026-08-08 16:33 UTCEPSS rescore
  25. 2026-08-07 16:23 UTCEPSS rescore
  26. 2026-08-06 13:43 UTCEPSS rescore
  27. 2026-08-06 04:54 UTCOSV refresh
  28. 2026-08-05 19:14 UTCEPSS rescore
  29. 2026-08-04 15:06 UTCEPSS rescore
  30. 2026-08-04 10:34 UTCEPSS rescore
  31. 2026-08-03 10:32 UTCEPSS rescore
  32. 2026-08-02 02:23 UTCEPSS rescore
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  34. 2026-07-30 16:24 UTCEPSS rescore
  35. 2026-07-30 01:27 UTCEPSS rescore
  36. 2026-07-28 15:32 UTCEPSS rescore
  37. 2026-07-26 14:51 UTCEPSS rescore
  38. 2026-07-25 14:14 UTCEPSS rescore
  39. 2026-07-24 14:14 UTCEPSS rescore
  40. 2026-07-23 14:15 UTCEPSS rescore
  41. 2026-07-23 14:15 UTCEPSS rescore
  42. 2026-07-23 01:47 UTCEG score recompute
  43. 2026-07-22 22:30 UTCEG score recompute
  44. 2026-07-22 14:05 UTCEPSS rescore
  45. 2026-07-21 15:22 UTCEPSS rescore
  46. 2026-07-21 15:22 UTCEPSS rescore
  47. 2026-07-20 17:04 UTCEPSS rescore
  48. 2026-07-20 17:04 UTCOSV refresh
  49. 2026-07-19 14:28 UTCEPSS rescore
  50. 2026-07-19 14:28 UTCEPSS rescore
  51. 2026-07-19 02:26 UTCEPSS rescore
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  53. 2026-07-18 10:02 UTCEPSS rescore
  54. 2026-07-16 16:59 UTCEPSS rescore
  55. 2026-07-16 16:59 UTCEPSS rescore
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  57. 2026-07-13 22:27 UTCEPSS rescore
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  60. 2026-07-12 05:44 UTCEPSS rescore
  61. 2026-07-11 08:24 UTCEPSS rescore
  62. 2026-07-09 19:06 UTCEPSS rescore
  63. 2026-07-08 15:11 UTCEPSS rescore
  64. 2026-07-07 13:43 UTCEPSS rescore
  65. 2026-07-06 16:25 UTCEPSS rescore
  66. 2026-07-06 16:25 UTCEPSS rescore
  67. 2026-07-06 02:20 UTCEPSS rescore
  68. 2026-07-05 02:27 UTCEPSS rescore
  69. 2026-07-04 06:28 UTCEPSS rescore
  70. 2026-07-03 12:26 UTCOSV refresh
  71. 2026-07-01 15:03 UTCEPSS rescore
  72. 2026-07-01 15:03 UTCEPSS rescore
  73. 2026-06-30 23:20 UTCEPSS rescore
  74. 2026-06-30 23:20 UTCEPSS rescore
  75. 2026-06-29 14:04 UTCEPSS rescore

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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 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 2.1% probability of exploitation in the next 30 days (80th percentile of EPSS-scored CVEs).
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?
A fix for CVE-2019-9796 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2019-9796 are linked in the Vendor Advisories panel on this page.

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