Security readout for executives and security teams
Plain-English summary
CVE-2018-3839 is a high-severity flaw in SDL2_image 2.0.2. If software renders a malicious XCF image, memory corruption on the heap may allow code execution. The user or application must open or display the crafted image, so exposure depends on where SDL2_image handles untrusted images.
Executive priority
Treat this as a targeted patching and exposure-reduction item. It is serious because code execution is possible, but urgency should be driven by whether vulnerable software processes untrusted images. Prioritize internet-facing, user-upload, and automated image-processing environments first.
Technical view
The issue is an out-of-bounds heap write in the XCF image rendering functionality of Simple DirectMedia Layer SDL2_image 2.0.2. The CVSS 3.0 score is 7.5 with network attack vector, high complexity, no privileges required, and user interaction required. Confidentiality, integrity, and availability impacts are rated high.
Likely exposure
Organizations are most likely exposed through applications, packages, or appliances that include SDL2_image 2.0.2 and process XCF images from users, partners, or external content. Linux distribution advisories indicate packaged deployments were affected. The supplied evidence does not enumerate every downstream product.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. Exploitation requires a specially crafted XCF image to be displayed by vulnerable software. Practical risk is higher where image rendering is automatic or accepts untrusted files.
Researcher notes
Key evidence points to TALOS-2018-0521 and distribution advisories. The affected version explicitly cited is SDL2_image 2.0.2. No CWE is supplied in the bundle. Do not assume active exploitation or fixed versions beyond the cited vendor advisories without checking those sources directly.
Mitigation direction
- Inventory systems and applications for SDL2_image 2.0.2.
- Apply applicable Debian, Gentoo, or vendor security updates.
- Check downstream vendor guidance for embedded SDL2_image usage.
- Restrict or disable XCF rendering where it is unnecessary.
- Avoid processing untrusted XCF files until patched.
Validation and detection
- Confirm installed SDL2_image package versions against vendor advisories.
- Review SBOMs for bundled SDL2_image 2.0.2 copies.
- Identify workflows that render XCF images from untrusted sources.
- Verify patched systems still handle required image formats correctly.
- Check security tooling for alerts tied to suspicious XCF files.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-3839 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H1.65.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.5HighVector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- DSA-4177CVE reference · vendor-advisory
- DSA-4184CVE reference · vendor-advisory
- GLSA-201903-17CVE reference · vendor-advisory
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0521CVE reference
- https://www.starwindsoftware.com/security/sw-20191008-0002/CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.