Vulnerability · Published Dec 9, 2020 · Assigned by mozilla
CVE-2020-26960
High 8.8
In plain English
A high-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 75% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.8High
Exploit odds (30 days)1.6%top 24.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
If the Compact() method was called on an nsTArray, the array could have been reallocated without updating other pointers, leading to a potential use-after-free and exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 83.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.21 | firefox | 83.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.22 | firefox | 83.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.23 | firefox | 83.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.20 | firefox-esr | 78.5.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.21 | firefox-esr | 78.5.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.22 | firefox-esr | 78.5.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.23 | firefox-esr | 78.5.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.21 | librewolf | 83.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.22 | librewolf | 83.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.23 | librewolf | 83.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.24 | librewolf | 83.0-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.20 | thunderbird | 78.5.1-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.21 | thunderbird | 78.5.1-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.22 | thunderbird | 78.5.1-r0 | ALPINE-CVE-2020-26960 |
| Alpine:v3.23 | thunderbird | 78.5.1-r0 | ALPINE-CVE-2020-26960 |
| Debian:12 | firefox-esr | 78.5.0esr-1 | DEBIAN-CVE-2020-26960 |
| Debian:13 | firefox-esr | 78.5.0esr-1 | DEBIAN-CVE-2020-26960 |
| Debian:14 | firefox-esr | 78.5.0esr-1 | DEBIAN-CVE-2020-26960 |
| Debian:12 | thunderbird | 1:78.5.0-1 | DEBIAN-CVE-2020-26960 |
| Debian:13 | thunderbird | 1:78.5.0-1 | DEBIAN-CVE-2020-26960 |
| Debian:14 | thunderbird | 1:78.5.0-1 | DEBIAN-CVE-2020-26960 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 83 |
| Mozilla | Firefox ESR | < 78.5 |
| Mozilla | Thunderbird | < 78.5 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1670358 x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-50/ x_refsource_CONFIRM
- https://www.mozilla.org/security/advisories/mfsa2020-52/ x_refsource_CONFIRM
- https://www.mozilla.org/security/advisories/mfsa2020-51/ x_refsource_CONFIRM