CVE-2023-28115

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 2.8%, top 15% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Snappy is a PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page. Prior to version 1.4.2, Snappy is vulnerable to PHAR deserialization due to a lack of checking on the protocol before passing it into the file_exists() function. If an attacker can upload files of any type to the server he can pass in the phar:// protocol to unserialize the uploaded file and instantiate arbitrary PHP objects. This can lead to remote code execution especially when snappy is used with frameworks with documented POP chains like Laravel/Symfony vulnerable developer code. If a user can control the output file from the generateFromHtml() function, it will invoke deserialization. This vulnerability is capable of remote code execution if Snappy is used with frameworks or developer code with vulnerable POP chains. It has been fixed in version 1.4.2.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation3% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
84.7%
KEV
Not listed

Published

March 17, 2023

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated May 25, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github_release, github.
github_pr Patch Available

fix: security issue GHSA-gq6w-q6wh-jggc

Patch available: KnpLabs/snappy v1.4.2 (PR #469 merged 2023-03-17)

https://github.com/KnpLabs/snappy/pull/469
github_commit Patch Available

commit b66f79334421 (KnpLabs/snappy)

Patch available: KnpLabs/snappy v1.4.2 (contains commit b66f79334421)

https://github.com/KnpLabs/snappy/commit/b66f79334421c26d9c244427963fa2d92980b5d3
github_commit Patch Available

commit 1ee6360cbdbe (KnpLabs/snappy)

Patch available: KnpLabs/snappy v1.4.2 (contains commit 1ee6360cbdbe)

https://github.com/KnpLabs/snappy/commit/1ee6360cbdbea5d09705909a150df7963a88efd6
generic

snappy/src/Knp/Snappy/AbstractGenerator.php at 5126fb5b335ec929a226314d40cd8dad497c3d67 · KnpLabs/snappy · GitHub

https://github.com/KnpLabs/snappy/blob/5126fb5b335ec929a226314d40cd8dad497c3d67/src/Knp/Snappy/AbstractGenerator.php#L670
github Patch Available🟡 PoC Available

PHAR deserialization allowing remote code execution · Advisory · KnpLabs/snappy · GitHub

https://github.com/KnpLabs/snappy/security/advisories/GHSA-gq6w-q6wh-jggc
github_release Patch Available

v1.4.2

Patch available: KnpLabs/snappy v1.4.2

https://github.com/KnpLabs/snappy/releases/tag/v1.4.2

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
knplabs/knp-snappy0.1.0 ... v1.4.1 (27 versions)1.4.2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 52× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 103 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2023-28115?
CVE-2023-28115 is a critical vulnerability published on March 17, 2023. Snappy is a PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page. Prior to version 1.4.2, Snappy is vulnerable to PHAR deserialization due to a lack of checking on the protocol before passing it into the file_exists() function. If an attacker can upload files of any…
When was CVE-2023-28115 disclosed?
CVE-2023-28115 was first published in the National Vulnerability Database on March 17, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-28115 actively exploited?
CVE-2023-28115 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 84.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-28115?
CVE-2023-28115 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-28115?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-28115, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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