CIA-UAP-018 is a Central Intelligence Agency information report disseminated on April 17, 1956, and released publicly in PURSUE Release 03 on June 12, 2026. The document, bearing report number OO-B-93674, records an account of unusual aerial phenomena observed in Hungary in late 1955, with the Budapest region identified as the incident location. The source material is a private letter exchanged between a naturalized U.S. citizen of Hungarian extraction and a niece residing in Budapest.123
Provenance and Chain of Custody
CIA-UAP-018 was approved for release under Section 1842 of the National Defense Authorization Act for Fiscal Year 2024. A more heavily redacted version of this report had previously been available on the CIA's public website, meaning this PURSUE release provides a fuller look at a document that was already partially known to researchers.
The three-page report was distributed on April 17, 1956, roughly five months after the letter from which it derives was received in November 1955. The cover sheet of the report identifies the reporting source as a naturalized U.S. citizen of Hungarian extraction who maintained regular correspondence with two nieces living in Budapest. The CIA obtained the information from a photostatic copy of the original Hungarian-language letter along with an English translation; both were marked UNCLASSIFIED and held on loan at the CIA Library.
At the time of its original dissemination, the document carried strict access restrictions. Distribution was confined to full-time employees of the CIA, the Atomic Energy Commission, and the Federal Bureau of Investigation. Within the State and Defense departments, access was limited to dissemination components, offices producing National Intelligence Survey elements, and senior staff. The report was explicitly prohibited from dissemination to consultants, reserve personnel on leave from active duty, and any foreign recipients -- the cover sheet carried a NOFORM designation barring distribution abroad.
Document Structure and Classification Status
The report runs to three pages. Page 1 is the cover sheet containing classification markings, source details, dissemination restrictions, and report metadata. Pages 2 and 3 contain the substantive content: the text of the personal letter from the niece, which opens with Christmas greetings and covers a mixture of family matters and observations about unusual aerial phenomena. Page 3 closes with only the reference number Ref-OO-B 93674 at the top, consistent with standard routing documentation.
The cover sheet carries the explicit notice "THIS IS UNEVALUATED INFORMATION," a formal designation indicating that no CIA analytical assessment of the report's credibility, reliability, or accuracy was conducted at the time of dissemination. The report was a collection product, not an analytical one: it preserved and routed the raw source material without appending judgments about the phenomena described.
The November 1955 Letter
In November 1955, the reporting source received a letter from his niece in Budapest. The cover sheet notes that this was the first time the niece had mentioned unusual aerial objects in her correspondence. The letter was primarily a family communication, touching on routine matters including a school vacation scheduled from December 20 through January 17, a family member's back trouble, and an account of attending a German circus. Amid this domestic content, the niece included an account of phenomena that had captured widespread public attention in Hungary.
The passage concerning the unusual aerial phenomena, as rendered in free translation from the Hungarian, reads:
"The so-called flying saucers (rockets) [sic] for several weeks kept the people in a nervous state. These very fast speeding flyers kept scientific groups very busy. I'm sure you heard already from the papers; 12 thousand km per hour was estimated on these flyers."
A parallel rendering from the fuller letter text conveys substantially the same account:
"Everyone has been excited by the so-called saucers for the past few weeks. These fast-rushing heavenly phenomena have been and still are keeping scores of scientists busy. [Addressee] has surely seen them or read about them; these amazing fliers moved at a speed of 12,000 kilometers per hour."
The niece's parenthetical insertion of "rockets" after "flying saucers," marked [sic] in the translation, reflects the ambiguity in popular terminology of the period. No specific sighting date, time, or precise location is provided beyond the general Budapest region.
Key Reported Characteristics
The niece's account attributes several notable characteristics to the phenomena:
Speed: An estimated 12,000 kilometers per hour (approximately 7,456 miles per hour). This figure is attributed to general public knowledge or press reporting rather than to any technical measurement source the niece directly cites.
Duration: The sightings reportedly persisted over "several weeks" spanning the autumn of 1955.
Formation and trajectory: The niece included a hand-drawn sketch with her letter depicting the formation and suspected course of the objects. The sketch showed a line of circular objects traveling from Budapest toward Moscow, with both cities labeled on a simplified map.
Public and scientific response: The niece described a significant social reaction, stating the phenomena "kept the people in a nervous state" and that "scientific groups" or "scores of scientists" were actively occupied with investigating them. She referenced press coverage, suggesting the sightings had received public reporting in Hungary at the time.
The phenomena are referred to interchangeably in the letter as "flying saucers," "rockets," "fast-rushing heavenly phenomena," and "amazing fliers." No single official Hungarian designation appears in the account.
Assessment and Intelligence Context
The account in CIA-UAP-018 is entirely secondhand. The reporting source -- the naturalized U.S. citizen -- was not a witness; he received the information from his niece's personal letter. The niece's account is itself a summary of events that had reportedly been covered in the Hungarian press and discussed by scientists, rather than a direct eyewitness narrative from a specific sighting occasion. No named witnesses, specific institutions, official Hungarian government statements, or named press sources are cited anywhere in the document.
The CIA's formal designation of the content as "UNEVALUATED INFORMATION" reflects the agency's own position at the time: the report was filed as raw intelligence input with no accompanying analysis, no assessment of credibility, and no attempt to correlate the account with other reporting. The document itself does not indicate whether any follow-up collection or analytical effort was undertaken.
The speed figure of 12,000 kilometers per hour, if taken at face value, would have exceeded the top speed of any known aircraft or missile of the mid-1950s by a substantial margin. The U-2 reconnaissance aircraft, which entered operational service in 1955, had a maximum speed in the range of 800 kilometers per hour. No context for how the speed estimate was arrived at -- whether by radar, visual estimation, or press speculation -- is provided in the letter or the report.
The trajectory indicated in the niece's sketch, running from Budapest toward Moscow, may reflect Cold War anxieties and the geographic orientation of observers in Hungary rather than any confirmed course of the objects.
What The Record Supports
CIA-UAP-018 documents that in late 1955, a Hungarian woman in Budapest wrote to a relative in the United States describing widespread public excitement over unusual fast-moving aerial phenomena, and that the CIA collected and disseminated this correspondence as raw intelligence in April 1956.
The record does not establish the identity, nature, origin, or physical characteristics of any aerial objects. It does not contain sensor data, radar tracks, photographic imagery, official Hungarian reporting, or any follow-up analytical assessment. The phenomena described remain unidentified. The account is secondhand, drawn from a private letter referencing general press coverage, and the CIA's own cover sheet classifies it explicitly as unevaluated information.
The PURSUE release of the fuller, less-redacted version of this document adds detail -- including the hand-drawn sketch and fuller letter text -- to a report previously available in more limited form on the CIA's public website. The additional detail does not resolve the underlying sighting accounts.