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CVE-2026-93479

CVE-2026-93479 · NGINX map directive and regex matching vulnerability

This page contains facts from public vulnerability sources. Check the original advisory before updating.

A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the root directive or access log format references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Impact:  This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS 9.2 · Critical · EPSS 0.6% · Fix available

Published
Updated

Stack: system · web

Affected products and versions

  • nginx plus

    Versions
    • ≥ 37.1.0, < 37.1.0.1: Affected (custom)
    • ≥ 37.0.0, < 37.0.5.1: Affected (custom)
    • ≥ R36: Affected (custom)
    • ≥ R35: Affected (custom)
    • ≥ R34: Affected (custom)
    • ≥ R33: Affected (custom)

    Update to 37.0.5.1; Update to 37.1.0.1

  • nginx

    Versions
    • ≥ 1.31.2, < 1.31.7: Affected (custom)
    • ≥ 1.30.0, < 1.30.6: Affected (custom)

    Update to 1.30.6; Update to 1.31.7

  • nginx Debian:12

    Versions
    • 1.22.1-9
    • 1.22.1-9+deb12u1
    • 1.22.1-9+deb12u10
    • 1.22.1-9+deb12u2
    • 1.22.1-9+deb12u3
    • 1.22.1-9+deb12u4
    • 1.22.1-9+deb12u5
    • 1.22.1-9+deb12u6
    • 1.22.1-9+deb12u7
    • 1.22.1-9+deb12u8
    • 1.22.1-9+deb12u9
    • 1.24.0-1
    • 1.24.0-1~exp1
    • 1.24.0-2
    • 1.26.0-1
    • 1.26.0-1~exp1
    • 1.26.0-2
    • 1.26.0-3
    • 1.26.2-1
    • 1.26.3-1
    • 1.26.3-2
    • 1.26.3-3
    • 1.28.0-1
    • 1.28.0-2
    • 1.28.0-3
    • 1.28.0-4
    • 1.28.0-5
    • 1.28.0-6
    • 1.28.1-1
    • 1.28.1-2
    • 1.28.1-3
    • 1.28.2-1
    • 1.28.2-2
    • 1.28.2-3
    • 1.28.2-4
    • 1.28.3-1
    • 1.28.3-2
    • 1.30.0-1
    • 1.30.0-2
    • 1.30.0-3
    • 1.30.0-4
    • 1.30.1-1
    • 1.30.1-2
    • 1.30.1-3
    • 1.30.1-4
    • 1.30.1-5
    • 1.30.1-6
    • 1.30.1-7
    • 1.30.4-1
    • 1.30.4-2
    • 1.30.4-3
    • 1.30.4-4
    • 1.30.4-5
    • 1.30.4-6
    • 1.30.4-7
    • 1.30.4-8
    • 1.30.6-1
    • 1.30.6-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Debian:13

    Versions
    • 1.26.3-3
    • 1.26.3-3+deb13u1
    • 1.26.3-3+deb13u2
    • 1.26.3-3+deb13u3
    • 1.26.3-3+deb13u4
    • 1.26.3-3+deb13u5
    • 1.26.3-3+deb13u6
    • 1.26.3-3+deb13u7
    • 1.26.3-3+deb13u8
    • 1.26.3-3+deb13u9
    Affected ranges
    • ECOSYSTEM: < 1.26.3-3+deb13u10

    Update to 1.26.3-3+deb13u10

  • nginx Debian:14

    Versions
    • 1.26.3-3
    • 1.28.0-1
    • 1.28.0-2
    • 1.28.0-3
    • 1.28.0-4
    • 1.28.0-5
    • 1.28.0-6
    • 1.28.1-1
    • 1.28.1-2
    • 1.28.1-3
    • 1.28.2-1
    • 1.28.2-2
    • 1.28.2-3
    • 1.28.2-4
    • 1.28.3-1
    • 1.28.3-2
    • 1.30.0-1
    • 1.30.0-2
    • 1.30.0-3
    • 1.30.0-4
    • 1.30.1-1
    • 1.30.1-2
    • 1.30.1-3
    • 1.30.1-4
    • 1.30.1-5
    • 1.30.1-6
    • 1.30.1-7
    • 1.30.4-1
    • 1.30.4-2
    • 1.30.4-3
    • 1.30.4-4
    • 1.30.4-5
    • 1.30.4-6
    • 1.30.4-7
    Affected ranges
    • ECOSYSTEM: < 1.30.4-8

    Update to 1.30.4-8

  • nginx Ubuntu:Pro:14.04:LTS

    Versions
    • 1.4.1-3ubuntu1
    • 1.4.3-2ubuntu1
    • 1.4.4-1ubuntu1
    • 1.4.4-2ubuntu1
    • 1.4.4-4ubuntu1
    • 1.4.5-1ubuntu1
    • 1.4.6-1ubuntu2
    • 1.4.6-1ubuntu3
    • 1.4.6-1ubuntu3.1
    • 1.4.6-1ubuntu3.2
    • 1.4.6-1ubuntu3.3
    • 1.4.6-1ubuntu3.4
    • 1.4.6-1ubuntu3.5
    • 1.4.6-1ubuntu3.6
    • 1.4.6-1ubuntu3.7
    • 1.4.6-1ubuntu3.8
    • 1.4.6-1ubuntu3.9
    • 1.4.6-1ubuntu3.9+esm1
    • 1.4.6-1ubuntu3.9+esm2
    • 1.4.6-1ubuntu3.9+esm3
    • 1.4.6-1ubuntu3.9+esm4
    • 1.4.6-1ubuntu3.9+esm5
    • 1.4.6-1ubuntu3.9+esm6
    • 1.4.6-1ubuntu3.9+esm8
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Ubuntu:Pro:16.04:LTS

    Versions
    • 1.9.3-1ubuntu1
    • 1.9.6-2ubuntu1
    • 1.9.6-2ubuntu2
    • 1.9.9-0ubuntu1
    • 1.9.9-1ubuntu1
    • 1.9.10-0ubuntu1
    • 1.9.10-1ubuntu1
    • 1.9.11-0ubuntu1
    • 1.9.11-0ubuntu2
    • 1.9.12-0ubuntu1
    • 1.9.13-0ubuntu1
    • 1.9.14-0ubuntu1
    • 1.9.15-0ubuntu1
    • 1.10.0-0ubuntu0.16.04.1
    • 1.10.0-0ubuntu0.16.04.2
    • 1.10.0-0ubuntu0.16.04.3
    • 1.10.0-0ubuntu0.16.04.4
    • 1.10.3-0ubuntu0.16.04.1
    • 1.10.3-0ubuntu0.16.04.2
    • 1.10.3-0ubuntu0.16.04.3
    • 1.10.3-0ubuntu0.16.04.4
    • 1.10.3-0ubuntu0.16.04.5
    • 1.10.3-0ubuntu0.16.04.5+esm1
    • 1.10.3-0ubuntu0.16.04.5+esm2
    • 1.10.3-0ubuntu0.16.04.5+esm3
    • 1.10.3-0ubuntu0.16.04.5+esm4
    • 1.10.3-0ubuntu0.16.04.5+esm5
    • 1.10.3-0ubuntu0.16.04.5+esm6
    • 1.10.3-0ubuntu0.16.04.5+esm7
    • 1.10.3-0ubuntu0.16.04.5+esm9
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Ubuntu:Pro:18.04:LTS

    Versions
    • 1.12.1-0ubuntu2
    • 1.13.6-2ubuntu1
    • 1.13.6-2ubuntu2
    • 1.13.10-1ubuntu1
    • 1.13.12-0ubuntu1
    • 1.14.0-0ubuntu1
    • 1.14.0-0ubuntu1.1
    • 1.14.0-0ubuntu1.2
    • 1.14.0-0ubuntu1.3
    • 1.14.0-0ubuntu1.4
    • 1.14.0-0ubuntu1.5
    • 1.14.0-0ubuntu1.6
    • 1.14.0-0ubuntu1.7
    • 1.14.0-0ubuntu1.9
    • 1.14.0-0ubuntu1.10
    • 1.14.0-0ubuntu1.11
    • 1.14.0-0ubuntu1.11+esm1
    • 1.14.0-0ubuntu1.11+esm2
    • 1.14.0-0ubuntu1.11+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Ubuntu:Pro:20.04:LTS

    Versions
    • 1.16.1-0ubuntu2
    • 1.16.1-0ubuntu3
    • 1.17.5-0ubuntu1
    • 1.17.6-0ubuntu1
    • 1.17.7-0ubuntu1
    • 1.17.8-0ubuntu1
    • 1.17.8-0ubuntu2
    • 1.17.8-0ubuntu3
    • 1.17.9-0ubuntu1
    • 1.17.9-0ubuntu2
    • 1.17.9-0ubuntu3
    • 1.17.10-0ubuntu1
    • 1.18.0-0ubuntu1
    • 1.18.0-0ubuntu1.2
    • 1.18.0-0ubuntu1.3
    • 1.18.0-0ubuntu1.4
    • 1.18.0-0ubuntu1.5
    • 1.18.0-0ubuntu1.6
    • 1.18.0-0ubuntu1.7
    • 1.18.0-0ubuntu1.7+esm1
    • 1.18.0-0ubuntu1.7+esm3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Ubuntu:22.04:LTS

    Versions
    • 1.18.0-6ubuntu11
    • 1.18.0-6ubuntu12
    • 1.18.0-6ubuntu14
    • 1.18.0-6ubuntu14.1
    • 1.18.0-6ubuntu14.2
    • 1.18.0-6ubuntu14.3
    • 1.18.0-6ubuntu14.4
    • 1.18.0-6ubuntu14.5
    • 1.18.0-6ubuntu14.6
    • 1.18.0-6ubuntu14.7
    • 1.18.0-6ubuntu14.8
    • 1.18.0-6ubuntu14.10
    • 1.18.0-6ubuntu14.11
    • 1.18.0-6ubuntu14.12
    • 1.18.0-6ubuntu14.13
    • 1.18.0-6ubuntu14.14
    • 1.18.0-6ubuntu14.15
    • 1.18.0-6ubuntu14.16
    • 1.18.0-6ubuntu14.17
    • 1.18.0-6ubuntu14.18
    • 1.18.0-6ubuntu14.19
    • 1.18.0-6ubuntu14.20
    • 1.18.0-6ubuntu14.21
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Ubuntu:24.04:LTS

    Versions
    • 1.24.0-1ubuntu1
    • 1.24.0-2ubuntu1
    • 1.24.0-2ubuntu2
    • 1.24.0-2ubuntu3
    • 1.24.0-2ubuntu4
    • 1.24.0-2ubuntu6
    • 1.24.0-2ubuntu7
    • 1.24.0-2ubuntu7.1
    • 1.24.0-2ubuntu7.3
    • 1.24.0-2ubuntu7.4
    • 1.24.0-2ubuntu7.5
    • 1.24.0-2ubuntu7.6
    • 1.24.0-2ubuntu7.7
    • 1.24.0-2ubuntu7.8
    • 1.24.0-2ubuntu7.9
    • 1.24.0-2ubuntu7.10
    • 1.24.0-2ubuntu7.11
    • 1.24.0-2ubuntu7.12
    • 1.24.0-2ubuntu7.13
    • 1.24.0-2ubuntu7.14
    • 1.24.0-2ubuntu7.15
    • 1.24.0-2ubuntu7.16
    • 1.24.0-2ubuntu7.17
    • 1.24.0-2ubuntu7.18
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Ubuntu:26.10

    Versions
    • 1.28.3-2ubuntu1
    • 1.30.1-4ubuntu1
    • 1.30.1-6ubuntu1
    • 1.30.4-5ubuntu1
    • 1.30.4-7ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Ubuntu:26.04:LTS

    Versions
    • 1.28.0-6ubuntu1
    • 1.28.1-2ubuntu1
    • 1.28.1-3ubuntu1
    • 1.28.2-2ubuntu1
    • 1.28.3-2ubuntu1
    • 1.28.3-2ubuntu1.1
    • 1.28.3-2ubuntu1.2
    • 1.28.3-2ubuntu1.3
    • 1.28.3-2ubuntu1.4
    • 1.28.3-2ubuntu1.5
    • 1.28.3-2ubuntu1.6
    • 1.28.3-2ubuntu1.7
    • 1.28.3-2ubuntu1.8
    • 1.28.3-2ubuntu1.9
    • 1.28.3-2ubuntu1.10
    • 1.28.3-2ubuntu1.11
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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