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🛡️ CVE-2026-62992 — smarty

⚪ Unknown ✅ No Known Exploit CWE-22 NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Smarty: Symlink path traversal out of trusted directories

When Smarty's Security policy is enabled, secure_dir (and the configured template/trusted directories) restrict which local files a template may read via {include} and {fetch}. The trust check in Security::_checkDir() resolved the requested path with Smarty::_realpath(), which normalizes the path as a string only and does not follow symbolic links. A symlink placed inside a trusted directory therefore passed the trust check, while the underlying file_get_contents() followed it to an arbitrary file outside the sandbox (e.g. /etc/passwd).

Impact

An attacker able to (a) cause a symlink to exist inside a trusted directory (e.g. a user-upload area located within the template path) and (b) cause a template to reference that path can read arbitrary files readable by the PHP process, escaping the secure_dir boundary. Confidentiality impact only.

Patches

Fixed in 5.8.2. Security::_checkDir() now resolves the requested file with native realpath() and re-validates the canonical, symlink-free path against the trusted directories (which are canonicalized the same way, so legitimate symlinked deployment paths such as a Capistrano current symlink or macOS /var → /private/var keep working). It falls back to string normalization only when the file does not yet exist on disk.

Workarounds

Ensure no untrusted symlinks can be created within any directory listed in secure_dir/the trusted template directories; restrict write access to those directories to trusted processes only.

References

  • Fix commit: 99c048c
  • CWE-22

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. Rated impact: confidentiality high, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Attack requirements: None — no deployment-specific condition has to hold.
  • Privileges required: High — administrative rights are needed first.
  • User interaction: None — nobody has to be tricked into anything.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

CVE-2026-62992 is classified as CWE-22: Path Traversal. A file path built from user input is not confined to the intended directory, letting an attacker reach files elsewhere on the filesystem.

Affected software

CVE-2026-62992 is recorded against 2 packages.

  • smarty/smarty (fixed in 4.5.7)
  • unknown

Timeline and source

Published on 7 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)
github.com (Web)

Other advisories for this package

smarty/smarty has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-22: Path Traversal) in other software:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CWE CWE-22
Public Exploit ✅ No
Source NVD
Published 2026-08-07
Updated 2026-08-20
Modified 2026-08-07
Fix URL N/A

Affected Packages

Software From version Fixed in
smarty/smarty — 4.5.7
unknown — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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