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CVE-2026-6772

Incorrect boundary conditions in the Libraries component in NSS

Description

Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Timeline

  1. ID reserved

    By mozilla

  2. Published

  3. · 35 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-6772, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVDNVD · Analyzed3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (exploitation in 30 days)
0.39% · top 66% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

  • Mozilla · Firefox

    • unaffected 115.35 – ≤ 115.*
    • unaffected 140.10 – ≤ 140.*
    • unaffected 150 – ≤ *

  • Mozilla · Thunderbird

    • unaffected 140.10 – ≤ 140.*
    • unaffected 150 – ≤ *

References

References6

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .