Description
Ownership mismanagement led to a use-after-free in ReadableByteStreams This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 120 | 120 |
| Mozilla | Firefox ESR | unspecified – < 115.5.0 | 115.5.0 |
| Mozilla | Thunderbird | unspecified – < 115.5 | 115.5 |
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 | 115.5.0esr-1 | — |
| Debian 14 | thunderbird | 1:115.5.0-1 | — |
| Debian 13 | firefox-esr | 115.5.0esr-1 | — |
| Debian 13 | thunderbird | 1:115.5.0-1 | — |
| Debian 12 | firefox-esr | 115.5.0esr-1~deb12u1 | DSA-5561-1 |
| Debian 12 | thunderbird | 1:115.5.0-1~deb12u1 | DSA-5566-1 |
| Debian 11 | firefox-esr | 115.5.0esr-1~deb11u1 | DSA-5561-1 |
| Debian 11 | thunderbird | 1:115.5.0-1~deb11u1 | DSA-5566-1 |
| Debian 10 | firefox-esr | 115.5.0esr-1~deb10u1 | DLA-3661-1 |
| Debian 10 | thunderbird | 1:115.5.0-1~deb10u1 | DLA-3674-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 | No fix yet | — |
| Ubuntu 24.04 LTS | thunderbird | 1:115.5.0+build1-0ubuntu1 | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | 1:115.5.0+build1-0ubuntu0.22.04.1 | USN-6515-1 |
| Ubuntu 20.04 LTS | firefox | 120.0+build2-0ubuntu0.20.04.1 | USN-6509-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:115.5.0+build1-0ubuntu0.20.04.1 | USN-6515-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | firefox +2 | 115.5.0-1.el9_3 | RHSA-2023:7507, RHSA-2023:7501 |
| RHEL 8 | firefox +1 | 115.5.0-1.el8_9 | RHSA-2023:7508, RHSA-2023:7500 |
| RHEL 7 | firefox +1 | 115.5.0-1.el7_9 | RHSA-2023:7509, RHSA-2023:7505 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | firefox +2 | 115.5.0-1.el9_2 | RHSA-2023:7577, RHSA-2023:7499 |
| RHEL 9.0 EUS | firefox +1 | 115.5.0-1.el9_0 | RHSA-2023:7510, RHSA-2023:7506 |
| RHEL 8.8 EUS | firefox +1 | 115.5.0-1.el8_8 | RHSA-2023:7511, RHSA-2023:7504 |
| RHEL 8.6 EUS | firefox +1 | 115.5.0-1.el8_6 | RHSA-2023:7512, RHSA-2023:7503 |
| RHEL 8.4 TUS | firefox +1 | 115.5.0-1.el8_4 | RHSA-2023:7570, RHSA-2023:7569 |
| RHEL 8.4 E4S | firefox +1 | 115.5.0-1.el8_4 | RHSA-2023:7570, RHSA-2023:7569 |
| RHEL 8.4 AUS | firefox +1 | 115.5.0-1.el8_4 | RHSA-2023:7570, RHSA-2023:7569 |
| RHEL 8.2 TUS | firefox +1 | 115.5.0-1.el8_2 | RHSA-2023:7574, RHSA-2023:7573 |
| RHEL 8.2 E4S | firefox +1 | 115.5.0-1.el8_2 | RHSA-2023:7574, RHSA-2023:7573 |
| RHEL 8.2 AUS | firefox +1 | 115.5.0-1.el8_2 | RHSA-2023:7574, RHSA-2023:7573 |
| RHEL 8.1 E4S | firefox +1 | 115.5.0-1.el8_1 | RHSA-2023:7547, RHSA-2023:7502 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | firefox +1 | 115.5.0-1.el9_3.alma.1 | ALSA-2023:7507 |
| AlmaLinux 9 | thunderbird | 115.5.0-1.el9_3.alma | ALSA-2023:7501 |
| AlmaLinux 8 | firefox +1 | 115.5.0-1.el8_9.alma.1 | ALSA-2023:7508, ALSA-2023:7500 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | thunderbird | 115.5.0-1.el8_9 | RLSA-2023:7500 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| SLES 15 SP5 | MozillaThunderbird | 115.5.0-150200.8.139.1 | SUSE-SU-2023:4588-1 |
| SLES 15 SP4 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| SLES 15 SP4 | MozillaThunderbird | 115.5.0-150200.8.139.1 | SUSE-SU-2023:4588-1 |
| SLES 15 SP3 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| SLES 15 SP2 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| SLES 15 SP1 | MozillaFirefox | 115.6.0-150000.150.119.1 | SUSE-SU-2023:4929-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 115.6.0-112.194.1 | SUSE-SU-2023:4912-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| SLES for SAP 15 SP1 | MozillaFirefox | 115.6.0-150000.150.119.1 | SUSE-SU-2023:4929-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 115.6.0-112.194.1 | SUSE-SU-2023:4912-1 |
| SLE Real Time 15 SP4 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| SLE HPC 15 SP1 | MozillaFirefox | 115.6.0-150000.150.119.1 | SUSE-SU-2023:4929-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 120.0-1.1 | openSUSE-SU-2024:13468-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 115.5.0-1.1 | openSUSE-SU-2024:13459-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 115.5.0-150200.8.139.1 | SUSE-SU-2023:4588-1 |
| openSUSE Leap 15.4 | MozillaFirefox | 115.6.0-150200.152.120.1 | SUSE-SU-2023:4928-1 |
| openSUSE Leap 15.4 | MozillaThunderbird | 115.5.0-150200.8.139.1 | SUSE-SU-2023:4588-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr +1 | 115.5.0-r0 | — |
| Alpine v3.22 | firefox-esr +1 | 115.5.0-r0 | — |
| Alpine v3.21 | firefox-esr +1 | 115.5.0-r0 | — |
| Alpine v3.20 | firefox-esr +1 | 115.5.0-r0 | — |
| Alpine v3.19 | firefox-esr +1 | 115.5.0-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr +1 | 115.5.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 115.5.0-1.amzn2.0.1 | ALAS2-2024-2379 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | firefox +2 | 115.5.0-1.0.1.el9_3 | ELSA-2023-7507, ELSA-2023-7501 |
| Oracle Linux 8 | firefox +1 | 115.5.0-1.0.1.el8_9 | ELSA-2023-7508, ELSA-2023-7500 |
| Oracle Linux 7 | firefox +1 | 115.5.0-1.0.1.el7_9 | ELSA-2023-7509, ELSA-2023-7505 |
Advisories 46
- ALSA-2023:7501 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:7507 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:7500 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:7508 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:7509 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2023:7505 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-6515-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-6509-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- RHSA-2023:7573 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7574 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7577 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7569 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7570 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7547 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7508 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7510 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7506 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7499 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7507 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7503 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7511 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7504 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7512 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7500 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7502 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:7501 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- DSA-5566-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5561-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3674-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3661-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:7500 Important: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2023:4912-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4928-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13459-1 MozillaThunderbird-115.5.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4588-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4929-1 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
- openSUSE-SU-2024:13468-1 MozillaFirefox-120.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2023-2995 Mozilla Firefox, Mozilla Firefox ESR und Mozilla Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 15, 2024
- ALAS2-2024-2379 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 9, 2024
- ELSA-2023-7507 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 28, 2023
- ELSA-2023-7501 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 28, 2023
- ELSA-2023-7508 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 28, 2023
- ELSA-2023-7500 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 28, 2023
- ELSA-2023-7505 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 28, 2023
- ELSA-2023-7509 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 27, 2023
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1861344
- https://www.mozilla.org/security/advisories/mfsa2023-49/
- https://www.mozilla.org/security/advisories/mfsa2023-50/
- https://www.mozilla.org/security/advisories/mfsa2023-52/
- https://www.debian.org/security/2023/dsa-5561
- https://lists.debian.org/debian-lts-announce/2023/11/msg00017.html
- https://lists.debian.org/debian-lts-announce/2023/11/msg00030.html