Vulnerability-Lookup

GHSA-5PGV-4JF4-9R43

Vulnerability from github – Published: 2026-04-18 06:30 – Updated: 2026-04-18 06:30

Details

In iTerm2 through 3.6.9, displaying a .txt file can cause code execution via DCS 2000p and OSC 135 data, if the working directory contains a malicious file whose name is valid output from the conductor encoding path, such as a pathname with an initial ace/c+ substring, aka "hypothetical in-band signaling abuse." This occurs because iTerm2 accepts the SSH conductor protocol from terminal output that does not originate from a legitimate conductor session.

Severity ?

6.9 (Medium)


                  
                    CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

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{
  "affected": [],
  "aliases": [
    "CVE-2026-41253"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-829"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-18T06:16:17Z",
    "severity": "MODERATE"
  },
  "details": "In iTerm2 through 3.6.9, displaying a .txt file can cause code execution via DCS 2000p and OSC 135 data, if the working directory contains a malicious file whose name is valid output from the conductor encoding path, such as a pathname with an initial ace/c+ substring, aka \"hypothetical in-band signaling abuse.\" This occurs because iTerm2 accepts the SSH conductor protocol from terminal output that does not originate from a legitimate conductor session.",
  "id": "GHSA-5pgv-4jf4-9r43",
  "modified": "2026-04-18T06:30:14Z",
  "published": "2026-04-18T06:30:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41253"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gnachman/iTerm2/commit/a9e745993c2e2cbb30b884a16617cd5495899f86"
    },
    {
      "type": "WEB",
      "url": "https://blog.calif.io/p/mad-bugs-even-cat-readmetxt-is-not"
    },
    {
      "type": "WEB",
      "url": "https://iterm2.com/downloads.html"
    },
    {
      "type": "WEB",
      "url": "https://news.ycombinator.com/item?id=47809190"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-41253 (GCVE-0-2026-41253)

Vulnerability from cvelistv5 – Published: 2026-04-18 05:27 – Updated: 2026-04-20 15:52

Summary

Severity ?

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

CWE

CWE-829 - Inclusion of Functionality from Untrusted Control Sphere

Assigner

mitre

References

URL

Tags

	https://iterm2.com/downloads.html
	https://blog.calif.io/p/mad-bugs-even-cat-readmet…
	https://github.com/gnachman/iTerm2/commit/a9e7459…
	https://news.ycombinator.com/item?id=47809190

Impacted products

	Vendor	Product	Version
	iTerm2	iTerm2	Affected: 0 , ≤ 3.6.9 (semver)

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JSON

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                "id": "CVE-2026-41253",
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                  },
                  {
                    "Automatable": "no"
                  },
                  {
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-20T15:51:58.997961Z",
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-5PGV-4JF4-9R43

CVE-2026-41253 (GCVE-0-2026-41253)

Tags

Sightings

Nomenclature