CVE-2016-5296: Mozilla Thunderbird vulnerability

CVE-2016-5296: A heap-buffer-overflow in Cairo when processing SVG content caused by compiler optimization, resulting in a...

A heap-buffer-overflow in Cairo when processing SVG content caused by compiler optimization, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 45.5, Firefox ESR < 45.5, and Firefox < 50.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 00:53 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2016-5296 is an old Mozilla client vulnerability where SVG content could trigger a heap buffer overflow in Cairo, causing a potentially exploitable crash. It affects Firefox before 50, Firefox ESR before 45.5, and Thunderbird before 45.5. Exposure is mainly legacy desktop or server-managed systems still running Firefox below 50, Firefox ESR below 45.5, or Thunderbird below 45.5. Modern supported Mozilla releases should not be affected according to the fixed-version boundaries in the source bundle. Treat as a legacy exposure cleanup item with elevated importance where old browsers or mail clients remain. The business risk is highest on endpoints that process untrusted web or email content using affected Mozilla versions. Mitigation focus: Upgrade Firefox to version 50 or later.; Upgrade Firefox ESR to version 45.5 or later.; Upgrade Thunderbird to version 45.5 or later..

Prepared: Jun 7, 2026, 06:44 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 11, 2018, 21:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
DSA-3730CVE reference · vendor-advisory, x_refsource_DEBIAN
https://bugzilla.mozilla.org/show_bug.cgi?id=1292443CVE reference · x_refsource_CONFIRM
GLSA-201701-15CVE reference · vendor-advisory, x_refsource_GENTOO
https://www.mozilla.org/security/advisories/mfsa2016-93/CVE reference · x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2016-89/CVE reference · x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2016-90/CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaThunderbirdunspecifiedListed

MozillaFirefox ESRunspecifiedListed

MozillaFirefoxunspecifiedListed

Weakness

CWE details

No CWE listed

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