Description
`AppendEncodedAttributeValue(), ExtraSpaceNeededForAttrEncoding()` and `AppendEncodedCharacters()` could have experienced integer overflows, causing underallocation of an output buffer leading to an out of bounds write. This vulnerability affects Firefox < 124, Firefox ESR < 115.9, and Thunderbird < 115.9.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 124 | 124 |
| Mozilla | Firefox ESR | unspecified – < 115.9 | 115.9 |
| Mozilla | Thunderbird | unspecified – < 115.9 | 115.9 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | firefox-esr | 115.9.0esr-1 | — |
| Debian 14 | thunderbird | 1:115.9.0-1 | — |
| Debian 13 | firefox-esr | 115.9.0esr-1 | — |
| Debian 13 | thunderbird | 1:115.9.0-1 | — |
| Debian 12 | firefox-esr | 115.9.0esr-1~deb12u1 | DSA-5643-1 |
| Debian 12 | thunderbird | 1:115.9.0-1~deb12u1 | DSA-5644-1 |
| Debian 11 | firefox-esr | 115.9.0esr-1~deb11u1 | DSA-5643-1 |
| Debian 11 | thunderbird | 1:115.9.0-1~deb11u1 | DSA-5644-1 |
| Debian 10 | firefox-esr | 115.9.1esr-1~deb10u1 | DLA-3775-1 |
| Debian 10 | thunderbird | 1:115.9.0-1~deb10u1 | DLA-3769-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | 1:115.9.0+build1-0ubuntu0.22.04.1 | USN-6717-1 |
| Ubuntu 20.04 LTS | firefox | 124.0+build1-0ubuntu0.20.04.1 | USN-6703-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:115.9.0+build1-0ubuntu0.20.04.1 | USN-6717-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | firefox +1 | 115.9.1-1.el9_3 | RHSA-2024:1485 |
| RHEL 9 | thunderbird | 115.9.0-1.el9_3 | RHSA-2024:1493 |
| RHEL 8 | firefox | 115.9.1-1.el8_9 | RHSA-2024:1484 |
| RHEL 8 | thunderbird | 115.9.0-1.el8_9 | RHSA-2024:1494 |
| RHEL 7 | firefox | 115.9.1-1.el7_9 | RHSA-2024:1486 |
| RHEL 7 | thunderbird | 115.9.0-1.el7_9 | RHSA-2024:1498 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | firefox +1 | 115.9.1-1.el9_2 | RHSA-2024:1483 |
| RHEL 9.2 EUS | thunderbird | 115.9.0-1.el9_2 | RHSA-2024:1492 |
| RHEL 9.0 EUS | firefox | 115.9.1-1.el9_0 | RHSA-2024:1487 |
| RHEL 9.0 EUS | thunderbird | 115.9.0-1.el9_0 | RHSA-2024:1495 |
| RHEL 8.8 EUS | firefox | 115.9.1-1.el8_8 | RHSA-2024:1488 |
| RHEL 8.8 EUS | thunderbird | 115.9.0-1.el8_8 | RHSA-2024:1496 |
| RHEL 8.6 EUS | firefox | 115.9.1-1.el8_6 | RHSA-2024:1489 |
| RHEL 8.6 EUS | thunderbird | 115.9.0-1.el8_6 | RHSA-2024:1497 |
| RHEL 8.4 TUS | firefox | 115.9.1-1.el8_4 | RHSA-2024:1491 |
| RHEL 8.4 TUS | thunderbird | 115.9.0-1.el8_4 | RHSA-2024:1499 |
| RHEL 8.4 E4S | firefox | 115.9.1-1.el8_4 | RHSA-2024:1491 |
| RHEL 8.4 E4S | thunderbird | 115.9.0-1.el8_4 | RHSA-2024:1499 |
| RHEL 8.4 AUS | firefox | 115.9.1-1.el8_4 | RHSA-2024:1491 |
| RHEL 8.4 AUS | thunderbird | 115.9.0-1.el8_4 | RHSA-2024:1499 |
| RHEL 8.2 TUS | firefox | 115.9.1-1.el8_2 | RHSA-2024:1490 |
| RHEL 8.2 TUS | thunderbird | 115.9.0-1.el8_2 | RHSA-2024:1500 |
| RHEL 8.2 E4S | firefox | 115.9.1-1.el8_2 | RHSA-2024:1490 |
| RHEL 8.2 E4S | thunderbird | 115.9.0-1.el8_2 | RHSA-2024:1500 |
| RHEL 8.2 AUS | firefox | 115.9.1-1.el8_2 | RHSA-2024:1490 |
| RHEL 8.2 AUS | thunderbird | 115.9.0-1.el8_2 | RHSA-2024:1500 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | firefox +1 | 115.9.1-1.el9_3.alma.1 | ALSA-2024:1485 |
| AlmaLinux 9 | thunderbird | 115.9.0-1.el9_3.alma.1 | ALSA-2024:1493 |
| AlmaLinux 8 | firefox | 115.9.1-1.el8_9.alma.1 | ALSA-2024:1484 |
| AlmaLinux 8 | thunderbird | 115.9.0-1.el8_9.alma.1 | ALSA-2024:1494 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | firefox | 115.9.1-1.el8_9 | RLSA-2024:1484 |
| Rocky Linux 8 | thunderbird | 115.9.0-1.el8_9 | RLSA-2024:1494 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES 15 SP5 | MozillaThunderbird | 115.9.0-150200.8.154.1 | SUSE-SU-2024:1147-1 |
| SLES 15 SP4 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES 15 SP3 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES 15 SP2 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES 12 SP5 | MozillaFirefox | 115.9.0-112.203.2 | SUSE-SU-2024:0971-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP4 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 115.9.0-112.203.2 | SUSE-SU-2024:0971-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 124.0.1-1.1 | openSUSE-SU-2024:13795-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 115.9.0-1.1 | openSUSE-SU-2024:13789-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 115.9.0-150200.8.154.1 | SUSE-SU-2024:1147-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox-esr | 115.9.0-r0 | — |
| Alpine v3.18 | firefox-esr | 115.9.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 115.9.0-1.amzn2.0.1 | ALAS2-2024-2505 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | firefox +1 | 115.9.1-1.0.1.el9_3 | ELSA-2024-1485 |
| Oracle Linux 9 | thunderbird | 115.9.0-1.0.1.el9_3 | ELSA-2024-1493 |
| Oracle Linux 8 | firefox | 115.9.1-1.0.1.el8_9 | ELSA-2024-1484 |
| Oracle Linux 8 | thunderbird | 115.9.0-1.0.1.el8_9 | ELSA-2024-1494 |
| Oracle Linux 7 | firefox | 115.9.1-1.0.1.el7_9 | ELSA-2024-1486 |
| Oracle Linux 7 | thunderbird | 115.9.0-1.0.1.el7_9 | ELSA-2024-1498 |
Advisories 45
- ALSA-2024:1485 Critical: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:1493 Moderate: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:1484 Critical: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:1494 Moderate: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:1496 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1500 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1499 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1492 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1495 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1494 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1497 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1498 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1493 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1491 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1489 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1490 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1488 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1487 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1485 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1486 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1484 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1483 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- USN-6717-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-6703-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5643-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5644-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3775-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3769-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:1484 Critical: firefox security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2024:1494 Moderate: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2024:0971-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13795-1 MozillaFirefox-124.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13789-1 MozillaThunderbird-115.9.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1002-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1147-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-0669 Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 15, 2024
- WID-SEC-2024-1248 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 21, 2024
- ALAS2-2024-2505 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 27, 2024
- ELSA-2024-1493 Moderate: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1485 Critical: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1494 Moderate: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1484 Critical: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1486 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1498 Moderate: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 25, 2024
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1880692
- https://www.mozilla.org/security/advisories/mfsa2024-12/
- https://www.mozilla.org/security/advisories/mfsa2024-13/
- https://www.mozilla.org/security/advisories/mfsa2024-14/
- https://lists.debian.org/debian-lts-announce/2024/03/msg00022.html
- https://lists.debian.org/debian-lts-announce/2024/03/msg00028.html