CVE-2026-2762

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-02-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2026-8484 (ENISA EUVD) · GHSA-v49m-r4w3-2p5x (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Integer overflow in the JavaScript: Standard Library component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
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
0.6%
EPSS %ILE
50th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; 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 (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 24, 2026

Last Modified

July 15, 2026

Advisory Details (10)

Auto-updated Oct 31, 2026
Patch available. Sources: redhat.
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.2 Advanced Update Support.

https://access.redhat.com/errata/RHSA-2026:3492
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support

https://access.redhat.com/errata/RHSA-2026:3491
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:3361
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:3339
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:3338
Web page

Security Vulnerabilities fixed in Thunderbird 140.8 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-17/
Web page

Security Vulnerabilities fixed in Thunderbird 148 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-16/
Web page

Security Vulnerabilities fixed in Firefox ESR 140.8 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-15/
Web page

Security Vulnerabilities fixed in Firefox 148 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-13/
Web page

2011649 - (CVE-2026-2762) EncodeForRegExpEscape output length size computation can overflow in 32-bit builds

https://bugzilla.mozilla.org/show_bug.cgi?id=2011649

Patch Availability(25)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatthunderbird-0:140.8.0-1.el8_22026-03-12redhat
redhatthunderbird-0:140.8.0-2.el10_02026-03-11redhat
redhatfirefox-0:140.8.0-2.el9_22026-03-10redhat
redhatfirefox-0:140.8.0-2.el7_92026-03-09redhat
redhatthunderbird-0:140.8.0-1.el8_62026-03-09redhat
redhatthunderbird-0:140.8.0-1.el9_42026-03-09redhat
redhatthunderbird-0:140.8.0-1.el8_82026-03-09redhat
redhatthunderbird-0:140.8.0-1.el9_62026-03-09redhat
redhatthunderbird-0:140.8.0-1.el9_22026-03-09redhat
redhatthunderbird-0:140.8.0-2.el8_42026-03-09redhat
redhatthunderbird-0:140.8.0-1.el9_02026-03-09redhat
redhatfirefox-0:140.8.0-2.el10_02026-03-09redhat
redhatfirefox-0:140.8.0-2.el8_62026-03-02redhat
redhatthunderbird-0:140.8.0-1.el9_72026-03-02redhat
redhatfirefox-0:140.8.0-2.el9_62026-03-02redhat
redhatfirefox-0:140.8.0-2.el8_82026-03-02redhat
redhatfirefox-0:140.8.0-2.el9_42026-03-02redhat
redhatthunderbird-0:140.8.0-2.el10_12026-03-02redhat
redhatfirefox-0:140.8.0-2.el8_42026-03-02redhat
redhatthunderbird-0:140.8.0-1.el8_102026-03-02redhat
redhatfirefox-0:140.8.0-2.el9_02026-03-02redhat
redhatfirefox-0:140.8.0-2.el8_22026-03-02redhat
redhatfirefox-0:140.8.0-2.el10_12026-02-25redhat
redhatfirefox-0:140.8.0-2.el8_102026-02-25redhat
redhatfirefox-0:140.8.0-2.el9_72026-02-25redhat

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

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (251 versions)
  • every version up to 140.8.0esr-1~deb11u1: fixed in 140.8.0esr-1~deb11u1
—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (302 versions)
  • every version up to 1:140.8.0esr-1~deb11u1: fixed in 1:140.8.0esr-1~deb11u1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.11.0esr-1 ... 140.8.0esr-1~deb11u1 (158 versions)
  • every version up to 140.8.0esr-1~deb12u1: fixed in 140.8.0esr-1~deb12u1
—
thunderbird1:102.11.0-1 ... 1:140.8.0esr-1~deb11u1 (187 versions)
  • every version up to 1:140.8.0esr-1~deb12u1: fixed in 1:140.8.0esr-1~deb12u1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.8.0esr-1~deb12u1 (34 versions)
  • every version up to 140.8.0esr-1~deb13u1: fixed in 140.8.0esr-1~deb13u1
—
thunderbird1:128.13.0esr-1 ... 1:140.8.0esr-1~deb12u1 (43 versions)
  • every version up to 1:140.8.0esr-1~deb13u1: fixed in 1:140.8.0esr-1~deb13u1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.8.0esr-1~deb13u1 (35 versions)
  • every version up to 140.8.0esr-1: fixed in 140.8.0esr-1
—
thunderbird1:128.13.0esr-1 ... 1:140.8.0esr-1~deb13u1 (44 versions)
  • every version up to 1:140.8.0esr-1: fixed in 1:140.8.0esr-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

Data Freshness Timeline

(refreshed 20× in last 7d / 87× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 400 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 300 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 20:47 UTCEchelonGraph re-scored
  2. 2026-11-12 20:47 UTCVendor advisory
  3. 2026-11-12 20:47 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  5. 2026-11-11 20:50 UTCEchelonGraph re-scored
  6. 2026-11-11 20:50 UTCVendor advisory
  7. 2026-11-11 20:50 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-11-11 16:39 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  9. 2026-11-10 20:46 UTCEchelonGraph re-scored
  10. 2026-11-10 20:46 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-11-10 16:43 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  12. 2026-11-09 20:33 UTCEchelonGraph re-scored
  13. 2026-11-09 20:33 UTCVendor advisory
  14. 2026-11-09 20:33 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  16. 2026-11-08 20:36 UTCEchelonGraph re-scored
  17. 2026-11-08 20:36 UTCVendor advisory
  18. 2026-11-08 20:36 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-11-08 16:39 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  20. 2026-11-07 20:39 UTCEchelonGraph re-scored
  21. 2026-11-07 20:39 UTCVendor advisory
  22. 2026-11-07 20:39 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  23. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  24. 2026-11-06 20:42 UTCEchelonGraph re-scored
  25. 2026-11-06 20:42 UTCVendor advisory
Show 75 more
  1. 2026-11-06 20:42 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  2. 2026-11-06 16:37 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  3. 2026-11-06 04:25 UTCOSV refresh
  4. 2026-11-05 20:45 UTCEchelonGraph re-scored
  5. 2026-11-05 20:45 UTCVendor advisory
  6. 2026-11-05 20:45 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-11-05 16:37 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  8. 2026-11-04 20:48 UTCEchelonGraph re-scored
  9. 2026-11-04 20:48 UTCVendor advisory
  10. 2026-11-04 20:48 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  12. 2026-11-03 20:51 UTCEchelonGraph re-scored
  13. 2026-11-03 20:51 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-11-03 16:47 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  15. 2026-11-02 20:52 UTCEchelonGraph re-scored
  16. 2026-11-02 20:52 UTCVendor advisory
  17. 2026-11-02 20:52 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  19. 2026-11-01 20:55 UTCEchelonGraph re-scored
  20. 2026-11-01 20:55 UTCVendor advisory
  21. 2026-11-01 20:55 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  23. 2026-10-31 20:57 UTCEchelonGraph re-scored
  24. 2026-10-31 20:57 UTCVendor advisory
  25. 2026-10-31 20:57 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  26. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  27. 2026-10-30 21:00 UTCEchelonGraph re-scored
  28. 2026-10-30 21:00 UTCVendor advisory
  29. 2026-10-30 21:00 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  30. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  31. 2026-10-29 21:03 UTCEchelonGraph re-scored
  32. 2026-10-29 21:03 UTCVendor advisory
  33. 2026-10-29 21:03 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  34. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  35. 2026-10-28 21:07 UTCEchelonGraph re-scored
  36. 2026-10-28 21:07 UTCVendor advisory
  37. 2026-10-28 21:06 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  38. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  39. 2026-10-27 21:08 UTCEchelonGraph re-scored
  40. 2026-10-27 21:08 UTCVendor advisory
  41. 2026-10-27 21:08 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  42. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  43. 2026-10-26 21:12 UTCEchelonGraph re-scored
  44. 2026-10-26 21:12 UTCVendor advisory
  45. 2026-10-26 21:11 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  46. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  47. 2026-10-25 19:09 UTCEchelonGraph re-scored
  48. 2026-10-25 19:09 UTCVendor advisory
  49. 2026-10-25 19:09 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  50. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  51. 2026-10-25 14:38 UTCEchelonGraph re-scored
  52. 2026-10-24 18:46 UTCEchelonGraph re-scored
  53. 2026-10-24 18:46 UTCVendor advisory
  54. 2026-10-24 18:46 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  55. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  56. 2026-10-23 18:50 UTCEchelonGraph re-scored
  57. 2026-10-23 18:50 UTCVendor advisory
  58. 2026-10-23 18:50 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  59. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  60. 2026-10-22 18:53 UTCEchelonGraph re-scored
  61. 2026-10-22 18:53 UTCVendor advisory
  62. 2026-10-22 18:53 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  63. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  64. 2026-10-21 18:56 UTCEchelonGraph re-scored
  65. 2026-10-21 18:56 UTCVendor advisory
  66. 2026-10-21 18:56 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  68. 2026-10-20 18:50 UTCEchelonGraph re-scored
  69. 2026-10-20 18:50 UTCVendor advisory
  70. 2026-10-20 18:50 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  72. 2026-10-19 18:53 UTCEchelonGraph re-scored
  73. 2026-10-19 18:53 UTCVendor advisory
  74. 2026-10-19 18:53 UTCGHSA enrichmentGHSA-v49m-r4w3-2p5x · GitHub severity CRITICAL · GitHub CVSS 9.8
  75. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile

Frequently asked(5)

What is CVE-2026-2762?
CVE-2026-2762 is a critical-severity vulnerability; its CVE record was published on February 24, 2026. Integer overflow in the JavaScript: Standard Library component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
When was the CVE record for CVE-2026-2762 published?
The CVE record for CVE-2026-2762 was published on February 24, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 15, 2026; the record at its source may have been updated since.
Is CVE-2026-2762 actively exploited?
CVE-2026-2762 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (50th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-2762?
CVE-2026-2762 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-2762?
A fix for CVE-2026-2762 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-2762 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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