CVE-2018-5156

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. 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: 4%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

A vulnerability can occur when capturing a media stream when the media source type is changed as the capture is occurring. This can result in stream data being cast to the wrong type causing a potentially exploitable crash. This vulnerability affects Thunderbird < 60, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

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%
Exploitation4% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
89%
KEV
Not listed

Published

October 18, 2018

Last Modified

November 25, 2025

Advisory Details (9)

Auto-updated Sep 17, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: redhat.
generic

Mozilla Thunderbird: Multiple vulnerabilities (GLSA 201811-13) — Gentoo security

https://security.gentoo.org/glsa/201811-13
generic

Mozilla Firefox: Multiple vulnerabilities (GLSA 201810-01) — Gentoo security

https://security.gentoo.org/glsa/201810-01
generic Patch Available

[SECURITY] [DLA 1575-1] thunderbird security update

https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
generic Patch Available

[SECURITY] [DLA 1406-1] firefox-esr security update

https://lists.debian.org/debian-lts-announce/2018/06/msg00014.html
generic🔴 Active Exploitation

1453127 - (CVE-2018-5156) SEGV in mozilla::MediaEncoder::AudioTrackListener::NotifyRealtimeTrackData

https://bugzilla.mozilla.org/show_bug.cgi?id=1453127
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:2113
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2018:2112
generic

CVE-2018-12362 - PSIRT.COM

http://www.securityfocus.com/bid/104560
generic
http://www.securitytracker.com/id/1041193

Vendor Advisories for CVE-2018-5156(2)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox (61.0+build3-0ubuntu0.17.10.1) @ artful2026-05-28ubuntu
redhatfirefox-0:60.1.0-5.el62018-06-28redhat
redhatfirefox-0:60.1.0-4.el7_52018-06-28redhat

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 rangeFixed inDependents
firefox-esr—52.9.0esr-1—
thunderbird—1:60.0-1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—52.9.0esr-1—
thunderbird—1:60.0-1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—52.9.0esr-1—
thunderbird—1:60.0-1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—52.9.0esr-1—
thunderbird—1:60.0-1—
Debian:8(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.0.1esr-1 ... 52.8.1esr-2 (97 versions)52.9.0esr-1~deb8u1—
thunderbird1.5-4 ... 1:60.2.1-2~deb9u1 (58 versions)1:60.3.0-1~deb8u1—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 52.9.0esr-1~deb8u1 (60 versions)52.9.0esr-1~deb9u1—
thunderbird1.5-4 ... 1:60.0~b9-2 (54 versions)1:60.0-3~deb9u1—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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 6× in last 7d / 23× 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 147 total refreshes for this CVE.

  1. 2026-09-19 15:36 UTCEPSS rescore
  2. 2026-09-18 19:22 UTCEPSS rescore
  3. 2026-09-17 19:22 UTCEPSS rescore
  4. 2026-09-15 03:05 UTCEPSS rescore
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  6. 2026-09-13 16:42 UTCEPSS rescore
  7. 2026-09-11 14:48 UTCEPSS rescore
  8. 2026-09-11 09:32 UTCEPSS rescore
  9. 2026-09-08 22:12 UTCOSV refresh
  10. 2026-09-06 13:44 UTCEPSS rescore
  11. 2026-09-04 13:56 UTCEPSS rescore
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  21. 2026-08-24 14:11 UTCEPSS rescore
  22. 2026-08-22 07:37 UTCOSV refresh
  23. 2026-08-21 23:45 UTCEPSS rescore
  24. 2026-08-20 22:51 UTCEPSS rescore
  25. 2026-08-19 17:00 UTCEPSS rescore
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  1. 2026-08-18 13:44 UTCEPSS rescore
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  6. 2026-08-13 21:56 UTCEPSS rescore
  7. 2026-08-12 13:47 UTCEPSS rescore
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  9. 2026-08-08 16:32 UTCEPSS rescore
  10. 2026-08-07 16:23 UTCEPSS rescore
  11. 2026-08-06 13:42 UTCEPSS rescore
  12. 2026-08-06 10:40 UTCOSV refresh
  13. 2026-08-04 15:05 UTCEPSS rescore
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  18. 2026-07-30 16:24 UTCEPSS rescore
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  20. 2026-07-28 15:32 UTCEPSS rescore
  21. 2026-07-27 14:05 UTCEPSS rescore
  22. 2026-07-26 14:51 UTCEPSS rescore
  23. 2026-07-25 14:14 UTCEPSS rescore
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  27. 2026-07-23 14:15 UTCEPSS rescore
  28. 2026-07-23 14:15 UTCEPSS rescore
  29. 2026-07-23 01:36 UTCEG score recompute
  30. 2026-07-22 22:16 UTCEG score recompute
  31. 2026-07-22 14:05 UTCEPSS rescore
  32. 2026-07-21 15:22 UTCEPSS rescore
  33. 2026-07-21 03:47 UTCOSV refresh
  34. 2026-07-20 17:04 UTCEPSS rescore
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  36. 2026-07-19 14:28 UTCEPSS rescore
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  40. 2026-07-16 16:59 UTCEPSS rescore
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  44. 2026-07-13 22:27 UTCEPSS rescore
  45. 2026-07-13 06:10 UTCEPSS rescore
  46. 2026-07-12 05:43 UTCEPSS rescore
  47. 2026-07-09 19:06 UTCEPSS rescore
  48. 2026-07-08 15:11 UTCEPSS rescore
  49. 2026-07-08 15:11 UTCEPSS rescore
  50. 2026-07-07 13:42 UTCEPSS rescore
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  58. 2026-07-03 22:56 UTCOSV refresh
  59. 2026-07-01 15:03 UTCEPSS rescore
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  75. 2026-06-21 14:54 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-5156?
CVE-2018-5156 is a critical vulnerability published on October 18, 2018. A vulnerability can occur when capturing a media stream when the media source type is changed as the capture is occurring. This can result in stream data being cast to the wrong type causing a potentially exploitable crash. This vulnerability affects Thunderbird < 60, Firefox ESR < 60.1, Firefox…
When was CVE-2018-5156 disclosed?
CVE-2018-5156 was first published in the National Vulnerability Database on October 18, 2018, 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-2018-5156 actively exploited?
CVE-2018-5156 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 10.6% of all scored CVEs.
What is the CVSS score of CVE-2018-5156?
CVE-2018-5156 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-5156?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-5156, 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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