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CVE-2026-17545

CVE-2026-17545 · PHP on Windows: Reserved Device Names Are Not Rejected Before File/Stream I/O which can cause DoS

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

On Windows, PHP's filesystem and stream APIs do not reject reserved device names such as CON, PRN, AUX, NUL, COM1 to COM9, LPT1 to LPT9, CONIN$ and CONOUT$ when they appear as a component of a path. An attacker-controlled filename therefore reaches CreateFileW() and opens a device instead of the regular file the application expected, which can block or hang the request and exhaust worker processes.

CVSS 6.9 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system · php

Affected products and versions

  • php

    Versions
    • ≥ 8.2.*, < 8.2.34: Affected (semver)
    • ≥ 8.3.*, < 8.3.35: Affected (semver)
    • ≥ 8.4.*, < 8.4.26: Affected (semver)
    • ≥ 8.5.*, < 8.5.11: Affected (semver)

    Update to 8.2.34; Update to 8.3.35; Update to 8.4.26; Update to 8.5.11

  • php5 Ubuntu:Pro:14.04:LTS

    Versions
    • 5.5.3+dfsg-1ubuntu2
    • 5.5.3+dfsg-1ubuntu3
    • 5.5.6+dfsg-1ubuntu1
    • 5.5.6+dfsg-1ubuntu2
    • 5.5.8+dfsg-2ubuntu1
    • 5.5.9+dfsg-1ubuntu1
    • 5.5.9+dfsg-1ubuntu2
    • 5.5.9+dfsg-1ubuntu3
    • 5.5.9+dfsg-1ubuntu4
    • 5.5.9+dfsg-1ubuntu4.1
    • 5.5.9+dfsg-1ubuntu4.2
    • 5.5.9+dfsg-1ubuntu4.3
    • 5.5.9+dfsg-1ubuntu4.4
    • 5.5.9+dfsg-1ubuntu4.5
    • 5.5.9+dfsg-1ubuntu4.6
    • 5.5.9+dfsg-1ubuntu4.7
    • 5.5.9+dfsg-1ubuntu4.9
    • 5.5.9+dfsg-1ubuntu4.11
    • 5.5.9+dfsg-1ubuntu4.12
    • 5.5.9+dfsg-1ubuntu4.13
    • 5.5.9+dfsg-1ubuntu4.14
    • 5.5.9+dfsg-1ubuntu4.16
    • 5.5.9+dfsg-1ubuntu4.17
    • 5.5.9+dfsg-1ubuntu4.19
    • 5.5.9+dfsg-1ubuntu4.20
    • 5.5.9+dfsg-1ubuntu4.21
    • 5.5.9+dfsg-1ubuntu4.22
    • 5.5.9+dfsg-1ubuntu4.23
    • 5.5.9+dfsg-1ubuntu4.24
    • 5.5.9+dfsg-1ubuntu4.25
    • 5.5.9+dfsg-1ubuntu4.26
    • 5.5.9+dfsg-1ubuntu4.27
    • 5.5.9+dfsg-1ubuntu4.29
    • 5.5.9+dfsg-1ubuntu4.29+esm1
    • 5.5.9+dfsg-1ubuntu4.29+esm2
    • 5.5.9+dfsg-1ubuntu4.29+esm3
    • 5.5.9+dfsg-1ubuntu4.29+esm4
    • 5.5.9+dfsg-1ubuntu4.29+esm5
    • 5.5.9+dfsg-1ubuntu4.29+esm6
    • 5.5.9+dfsg-1ubuntu4.29+esm8
    • 5.5.9+dfsg-1ubuntu4.29+esm10
    • 5.5.9+dfsg-1ubuntu4.29+esm11
    • 5.5.9+dfsg-1ubuntu4.29+esm12
    • 5.5.9+dfsg-1ubuntu4.29+esm13
    • 5.5.9+dfsg-1ubuntu4.29+esm14
    • 5.5.9+dfsg-1ubuntu4.29+esm15
    • 5.5.9+dfsg-1ubuntu4.29+esm16
    • 5.5.9+dfsg-1ubuntu4.29+esm17
    • 5.5.9+dfsg-1ubuntu4.29+esm18
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • php7.0 Ubuntu:Pro:16.04:LTS

    Versions
    • 7.0.1-5
    • 7.0.1-6
    • 7.0.2-1
    • 7.0.2-3
    • 7.0.2-4
    • 7.0.2-5
    • 7.0.3-2
    • 7.0.3-3
    • 7.0.3-9ubuntu1
    • 7.0.4-5ubuntu1
    • 7.0.4-5ubuntu2
    • 7.0.4-7ubuntu1
    • 7.0.4-7ubuntu2
    • 7.0.4-7ubuntu2.1
    • 7.0.8-0ubuntu0.16.04.1
    • 7.0.8-0ubuntu0.16.04.2
    • 7.0.8-0ubuntu0.16.04.3
    • 7.0.13-0ubuntu0.16.04.1
    • 7.0.15-0ubuntu0.16.04.1
    • 7.0.15-0ubuntu0.16.04.2
    • 7.0.15-0ubuntu0.16.04.4
    • 7.0.18-0ubuntu0.16.04.1
    • 7.0.22-0ubuntu0.16.04.1
    • 7.0.25-0ubuntu0.16.04.1
    • 7.0.28-0ubuntu0.16.04.1
    • 7.0.30-0ubuntu0.16.04.1
    • 7.0.32-0ubuntu0.16.04.1
    • 7.0.33-0ubuntu0.16.04.1
    • 7.0.33-0ubuntu0.16.04.2
    • 7.0.33-0ubuntu0.16.04.3
    • 7.0.33-0ubuntu0.16.04.4
    • 7.0.33-0ubuntu0.16.04.5
    • 7.0.33-0ubuntu0.16.04.6
    • 7.0.33-0ubuntu0.16.04.7
    • 7.0.33-0ubuntu0.16.04.9
    • 7.0.33-0ubuntu0.16.04.11
    • 7.0.33-0ubuntu0.16.04.12
    • 7.0.33-0ubuntu0.16.04.14
    • 7.0.33-0ubuntu0.16.04.15
    • 7.0.33-0ubuntu0.16.04.16
    • 7.0.33-0ubuntu0.16.04.16+esm1
    • 7.0.33-0ubuntu0.16.04.16+esm2
    • 7.0.33-0ubuntu0.16.04.16+esm3
    • 7.0.33-0ubuntu0.16.04.16+esm4
    • 7.0.33-0ubuntu0.16.04.16+esm5
    • 7.0.33-0ubuntu0.16.04.16+esm6
    • 7.0.33-0ubuntu0.16.04.16+esm7
    • 7.0.33-0ubuntu0.16.04.16+esm8
    • 7.0.33-0ubuntu0.16.04.16+esm9
    • 7.0.33-0ubuntu0.16.04.16+esm10
    • 7.0.33-0ubuntu0.16.04.16+esm11
    • 7.0.33-0ubuntu0.16.04.16+esm12
    • 7.0.33-0ubuntu0.16.04.16+esm13
    • 7.0.33-0ubuntu0.16.04.16+esm14
    • 7.0.33-0ubuntu0.16.04.16+esm15
    • 7.0.33-0ubuntu0.16.04.16+esm16
    • 7.0.33-0ubuntu0.16.04.16+esm17
    • 7.0.33-0ubuntu0.16.04.16+esm18
    • 7.0.33-0ubuntu0.16.04.16+esm19
    • 7.0.33-0ubuntu0.16.04.16+esm20
    • 7.0.33-0ubuntu0.16.04.16+esm21
    • 7.0.33-0ubuntu0.16.04.16+esm22
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • php7.2 Ubuntu:Pro:18.04:LTS

    Versions
    • 7.2.1-1ubuntu2
    • 7.2.2-1ubuntu1
    • 7.2.2-1ubuntu2
    • 7.2.3-1ubuntu1
    • 7.2.5-0ubuntu0.18.04.1
    • 7.2.7-0ubuntu0.18.04.1
    • 7.2.7-0ubuntu0.18.04.2
    • 7.2.10-0ubuntu0.18.04.1
    • 7.2.15-0ubuntu0.18.04.1
    • 7.2.15-0ubuntu0.18.04.2
    • 7.2.17-0ubuntu0.18.04.1
    • 7.2.19-0ubuntu0.18.04.1
    • 7.2.19-0ubuntu0.18.04.2
    • 7.2.24-0ubuntu0.18.04.1
    • 7.2.24-0ubuntu0.18.04.2
    • 7.2.24-0ubuntu0.18.04.3
    • 7.2.24-0ubuntu0.18.04.4
    • 7.2.24-0ubuntu0.18.04.6
    • 7.2.24-0ubuntu0.18.04.7
    • 7.2.24-0ubuntu0.18.04.8
    • 7.2.24-0ubuntu0.18.04.9
    • 7.2.24-0ubuntu0.18.04.10
    • 7.2.24-0ubuntu0.18.04.11
    • 7.2.24-0ubuntu0.18.04.12
    • 7.2.24-0ubuntu0.18.04.13
    • 7.2.24-0ubuntu0.18.04.15
    • 7.2.24-0ubuntu0.18.04.16
    • 7.2.24-0ubuntu0.18.04.17
    • 7.2.24-0ubuntu0.18.04.17+esm1
    • 7.2.24-0ubuntu0.18.04.17+esm2
    • 7.2.24-0ubuntu0.18.04.17+esm3
    • 7.2.24-0ubuntu0.18.04.17+esm4
    • 7.2.24-0ubuntu0.18.04.17+esm5
    • 7.2.24-0ubuntu0.18.04.17+esm6
    • 7.2.24-0ubuntu0.18.04.17+esm7
    • 7.2.24-0ubuntu0.18.04.17+esm8
    • 7.2.24-0ubuntu0.18.04.17+esm9
    • 7.2.24-0ubuntu0.18.04.17+esm10
    • 7.2.24-0ubuntu0.18.04.17+esm11
    • 7.2.24-0ubuntu0.18.04.17+esm12
    • 7.2.24-0ubuntu0.18.04.17+esm13
    • 7.2.24-0ubuntu0.18.04.17+esm14
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • php7.4 Ubuntu:Pro:20.04:LTS

    Versions
    • 7.4.3-4build1
    • 7.4.3-4build2
    • 7.4.3-4ubuntu1
    • 7.4.3-4ubuntu1.1
    • 7.4.3-4ubuntu2.2
    • 7.4.3-4ubuntu2.4
    • 7.4.3-4ubuntu2.5
    • 7.4.3-4ubuntu2.6
    • 7.4.3-4ubuntu2.7
    • 7.4.3-4ubuntu2.8
    • 7.4.3-4ubuntu2.9
    • 7.4.3-4ubuntu2.10
    • 7.4.3-4ubuntu2.11
    • 7.4.3-4ubuntu2.12
    • 7.4.3-4ubuntu2.13
    • 7.4.3-4ubuntu2.15
    • 7.4.3-4ubuntu2.16
    • 7.4.3-4ubuntu2.17
    • 7.4.3-4ubuntu2.18
    • 7.4.3-4ubuntu2.19
    • 7.4.3-4ubuntu2.20
    • 7.4.3-4ubuntu2.22
    • 7.4.3-4ubuntu2.23
    • 7.4.3-4ubuntu2.24
    • 7.4.3-4ubuntu2.26
    • 7.4.3-4ubuntu2.28
    • 7.4.3-4ubuntu2.29
    • 7.4.3-4ubuntu2.29+esm1
    • 7.4.3-4ubuntu2.29+esm2
    • 7.4.3-4ubuntu2.29+esm3
    • 7.4.3-4ubuntu2.29+esm4
    • 7.4.3-4ubuntu2.29+esm5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • php8.1 Ubuntu:22.04:LTS

    Versions
    • 8.1.0~rc4-1ubuntu2
    • 8.1.0-1
    • 8.1.2-1ubuntu1
    • 8.1.2-1ubuntu2
    • 8.1.2-1ubuntu2.1
    • 8.1.2-1ubuntu2.2
    • 8.1.2-1ubuntu2.3
    • 8.1.2-1ubuntu2.4
    • 8.1.2-1ubuntu2.5
    • 8.1.2-1ubuntu2.6
    • 8.1.2-1ubuntu2.8
    • 8.1.2-1ubuntu2.9
    • 8.1.2-1ubuntu2.10
    • 8.1.2-1ubuntu2.11
    • 8.1.2-1ubuntu2.13
    • 8.1.2-1ubuntu2.14
    • 8.1.2-1ubuntu2.15
    • 8.1.2-1ubuntu2.17
    • 8.1.2-1ubuntu2.18
    • 8.1.2-1ubuntu2.19
    • 8.1.2-1ubuntu2.20
    • 8.1.2-1ubuntu2.21
    • 8.1.2-1ubuntu2.22
    • 8.1.2-1ubuntu2.23
    • 8.1.2-1ubuntu2.24
    • 8.1.2-1ubuntu2.25
    • 8.1.2-1ubuntu2.26
    • 8.1.2-1ubuntu2.27
    • 8.1.2-1ubuntu2.28
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • php8.3 Ubuntu:24.04:LTS

    Versions
    • 8.3.0-1
    • 8.3.0-1ubuntu1
    • 8.3.4-1
    • 8.3.4-1build1
    • 8.3.6-0maysync1
    • 8.3.6-0ubuntu0.24.04.1
    • 8.3.6-0ubuntu0.24.04.2
    • 8.3.6-0ubuntu0.24.04.3
    • 8.3.6-0ubuntu0.24.04.4
    • 8.3.6-0ubuntu0.24.04.5
    • 8.3.6-0ubuntu0.24.04.6
    • 8.3.6-0ubuntu0.24.04.7
    • 8.3.6-0ubuntu0.24.04.8
    • 8.3.6-0ubuntu0.24.04.9
    • 8.3.6-0ubuntu0.24.04.10
    • 8.3.6-0ubuntu0.24.04.11
    • 8.3.6-0ubuntu0.24.04.12
    • 8.3.6-0ubuntu0.24.04.13
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • php8.5 Ubuntu:26.04:LTS

    Versions
    • 8.5.2-0ubuntu1
    • 8.5.4-0ubuntu1
    • 8.5.4-0ubuntu1.1
    • 8.5.4-0ubuntu1.2
    • 8.5.4-0ubuntu1.3
    • 8.5.4-0ubuntu1.4
    • 8.5.4-0ubuntu1.5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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