CVE-2026-39820
CVE-2026-39820 · Quadratic string concatentation in consumeComment in net/mail
This page contains facts from public vulnerability sources. Check the original advisory before updating.
This page shows selected source facts. See the linked advisories for the complete description and affected versions.
Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.
CVSS 7.5 · High · EPSS 0.8% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
net/mail
- Versions
- ≥ 0, < 1.25.10: Affected (semver)
- ≥ 1.26.0-0, < 1.26.3: Affected (semver)
Update to 1.25.10; Update to 1.26.3
golang-1.19 Debian:12
- Versions
- 1.19.10-1
- 1.19.10-2
- 1.19.11-1
- 1.19.12-1
- 1.19.12-2
- 1.19.12-2~bpo11+1
- 1.19.12-2~bpo12+1
- 1.19.13-1
- 1.19.13-1~bpo11+1
- 1.19.13-1~bpo12+1
- 1.19.8-2
- 1.19.9-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.24 Debian:13
- Versions
- 1.24.12-1
- 1.24.13-1
- 1.24.13-2
- 1.24.4-1
- 1.24.4-2
- 1.24.4-3
- 1.24.4-4
- 1.24.7-1
- 1.24.8-1
- 1.24.9-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.26 Debian:14
- Versions
- 1.26.0-1
- 1.26.1-1
- 1.26.2-1
- 1.26.2-2
- 1.26.2-3
- 1.26.3-1~bpo13+1
- 1.26~rc2-1
- 1.26~rc3-1
- 1.26~rc3-2
- Affected ranges
- ECOSYSTEM: < 1.26.3-1
Update to 1.26.3-1
golang-1.10 Ubuntu:14.04:LTS
- Versions
- 1.10.4-2ubuntu1~14.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.10 Ubuntu:16.04:LTS
- Versions
- 1.10.4-2ubuntu1~16.04.1
- 1.10.4-2ubuntu1~16.04.2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.6 Ubuntu:16.04:LTS
- Versions
- 1.6-0ubuntu1
- 1.6-0ubuntu2
- 1.6-0ubuntu3
- 1.6-0ubuntu4
- 1.6-0ubuntu5
- 1.6.1-0ubuntu1
- 1.6.2-0ubuntu5~16.04
- 1.6.2-0ubuntu5~16.04.2
- 1.6.2-0ubuntu5~16.04.3
- 1.6.2-0ubuntu5~16.04.4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.13 Ubuntu:Pro:16.04:LTS
- Versions
- 1.13.8-1ubuntu1~16.04.2
- 1.13.8-1ubuntu1~16.04.3
- 1.13.8-1ubuntu1~16.04.3+esm2
- 1.13.8-1ubuntu1~16.04.3+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.18 Ubuntu:Pro:16.04:LTS
- Versions
- 1.18.1-1ubuntu1~16.04.6
- 1.18.1-1ubuntu1~16.04.6+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.10 Ubuntu:18.04:LTS
- Versions
- 1.10~rc1-1
- 1.10~rc1-1ubuntu1
- 1.10~rc1-2ubuntu1
- 1.10~rc2-1ubuntu1
- 1.10-1ubuntu1
- 1.10.1-1ubuntu2
- 1.10.4-2ubuntu1~18.04.1
- 1.10.4-2ubuntu1~18.04.2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.13 Ubuntu:Pro:18.04:LTS
- Versions
- 1.13.8-1ubuntu1~18.04.2
- 1.13.8-1ubuntu1~18.04.3
- 1.13.8-1ubuntu1~18.04.4
- 1.13.8-1ubuntu1~18.04.4+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.16 Ubuntu:Pro:18.04:LTS
- Versions
- 1.16.2-0ubuntu1~18.04.2
- 1.16.2-0ubuntu1~18.04.2+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.18 Ubuntu:Pro:18.04:LTS
- Versions
- 1.18.1-1ubuntu1~18.04.3
- 1.18.1-1ubuntu1~18.04.4
- 1.18.1-1ubuntu1~18.04.4+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.8 Ubuntu:18.04:LTS
- Versions
- 1.8.3-2ubuntu1
- 1.8.3-2ubuntu1.18.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.9 Ubuntu:18.04:LTS
- Versions
- 1.9.1-2ubuntu1
- 1.9.2-1ubuntu1
- 1.9.2-3ubuntu1
- 1.9.3-1ubuntu1
- 1.9.4-1ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.13 Ubuntu:20.04:LTS
- Versions
- 1.13.1-1ubuntu1
- 1.13.3-1ubuntu1
- 1.13.4-1ubuntu1
- 1.13.5-1ubuntu1
- 1.13.6-1ubuntu1
- 1.13.6-2ubuntu1
- 1.13.7-1ubuntu1
- 1.13.8-1ubuntu1
- 1.13.8-1ubuntu1.1
- 1.13.8-1ubuntu1.2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.14 Ubuntu:20.04:LTS
- Versions
- 1.14~beta1-1
- 1.14~beta1-2
- 1.14~rc1-1
- 1.14-1
- 1.14.1-1
- 1.14.2-1
- 1.14.2-1ubuntu1
- 1.14.3-2ubuntu2~20.04.1
- 1.14.3-2ubuntu2~20.04.2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.16 Ubuntu:Pro:20.04:LTS
- Versions
- 1.16.2-0ubuntu1~20.04
- 1.16.2-0ubuntu1~20.04.1
- 1.16.2-0ubuntu1~20.04.1+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.18 Ubuntu:20.04:LTS
- Versions
- 1.18.1-1ubuntu1~20.04.1
- 1.18.1-1ubuntu1~20.04.2
- 1.18.1-1ubuntu1~20.04.3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.20 Ubuntu:20.04:LTS
- Versions
- 1.20.3-1ubuntu0.1~20.04
- 1.20.3-1ubuntu0.1~20.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.21 Ubuntu:20.04:LTS
- Versions
- 1.21.1-1~ubuntu20.04.1
- 1.21.1-1~ubuntu20.04.2
- 1.21.1-1~ubuntu20.04.3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.22 Ubuntu:20.04:LTS
- Versions
- 1.22.2-2~20.04.1
- 1.22.2-2~20.04.2
- 1.22.2-2~20.04.3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.17 Ubuntu:22.04:LTS
- Versions
- 1.17-1ubuntu2
- 1.17.3-1ubuntu1
- 1.17.3-1ubuntu2
- 1.17.13-3ubuntu1
- 1.17.13-3ubuntu1.2
- 1.17.13-3ubuntu1.3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
golang-1.18 Ubuntu:22.04:LTS
- Versions
- 1.18~beta1-0ubuntu1
- 1.18~beta2-1ubuntu1
- 1.18~beta2-1ubuntu2
- 1.18~rc1-1ubuntu1
- 1.18-1ubuntu1
- 1.18.1-1ubuntu1
- 1.18.1-1ubuntu1.1
- 1.18.1-1ubuntu1.2
- 1.18.1-1ubuntu1.3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- https://go.dev/issue/78566
- https://go.dev/cl/759940
- https://groups.google.com/g/golang-announce/c/qcCIEXso47M
- https://pkg.go.dev/vuln/GO-2026-4986
- https://access.redhat.com/security/cve/CVE-2026-39820
- https://bugzilla.redhat.com/show_bug.cgi?id=2467820
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39820.json
- https://access.redhat.com/errata/RHSA-2026:68334
- https://access.redhat.com/errata/RHSA-2026:50319
- https://access.redhat.com/errata/RHSA-2026:59830
- https://access.redhat.com/errata/RHSA-2026:65838
- https://access.redhat.com/errata/RHSA-2026:56852
- https://access.redhat.com/errata/RHSA-2026:60018
- https://access.redhat.com/errata/RHSA-2026:57482
- https://access.redhat.com/errata/RHSA-2026:54552
- https://access.redhat.com/errata/RHSA-2026:50336
- https://access.redhat.com/errata/RHSA-2026:57845
- https://access.redhat.com/errata/RHSA-2026:57914
- https://access.redhat.com/errata/RHSA-2026:57401
- https://access.redhat.com/errata/RHSA-2026:54883
- https://access.redhat.com/errata/RHSA-2026:49702
- https://access.redhat.com/errata/RHSA-2026:67517
- https://access.redhat.com/errata/RHSA-2026:65335
- https://nvd.nist.gov/vuln/detail/CVE-2026-39820